VIII. Behavioral Health Care Provider Model Components

Published 2023

In this module:

Modeling supply
Modeling demand
Exhibit data

This module describes the data and assumptions used in the Health Workforce Simulation Model (HWSM) to project the future supply and demand for behavioral health care providers. Behavioral health care includes treatment of mental health and substance abuse conditions, stress-linked physical symptoms, and patient activation and health behaviors.1

Some behavioral health occupations overlap those we cover in other modules. Behavioral health includes psychiatrists (see the Physicians module), psychiatric/mental health nurse practitioners (see the Advanced Practice Nurses module), and psychiatric/mental health physician assistants (see the Physician Assistants module). Some behavioral health services are provided by occupations not part of the behavioral health workforce as defined here for modeling—such as primary care providers.

This module describes the data and assumptions to model supply and demand projections for:

Psychologists
Substance abuse and behavioral disorder counselors (addiction counselors)
Mental health counselors
School counselors
Child, family, and school social workers
Health care social workers
Mental health and substance abuse social workers
Marriage and family therapists (MFTs)
Psychiatric aides and psychiatric technicians (demand modeling only)2 3

For modeling purposes, the definitions of psychologists, counselors, therapists, and social workers have evolved over the years. HRSA’s 2016 report4 included all psychologists trained at the master’s degree-level or higher, whereas HRSA’s subsequent projections include doctorate-level psychologists only. This change was based on feedback from the American Psychological Association that master’s-level psychologists generally work as counselors rather than as clinical psychologists.

Due to data challenges in distinguishing between clinical social workers and social workers in non-clinical roles, the criteria used to identify social workers for modeling have evolved across studies. Prior HRSA projections included social workers trained at the master’s degree-level or higher only, and that restriction applies to the most recent projections as well. A major data constraint is that national data sources such as the American Community Survey (ACS) and the Occupational Employment and Wage Statistics (OEWS) do not identify which social workers are clinical social workers. Starting with the projections developed in 2022, we model three types of social workers: (1) child, family, and school, (2) health care, and (3) mental health and substance abuse. Some modeling assumptions are the same across the three types of social workers, and when referring simply to social workers, the discussion implies all three types of social workers.

Also, starting in 2022, for modeling, we updated the definition for mental health counselors, school counselors, and marriage and family therapists to include only providers with a master’s degree or higher.

Every few years, the research team meets with professional associations representing behavioral health professions to identify the best available data sources, discuss trends affecting workforce supply and demand, and provide feedback on preliminary findings. The information provided in this technical documentation and in HRSA reports do not necessarily reflect the views of the associations that responded to our invitation to participate in the workforce study. There may not be a clear consensus on all assumptions. Individuals from the following associations have participated:

Association of Social Work Boards (ASWB)
American Academy of Physician Assistants (AAPA)
American Association for Marriage and Family Therapy (AAMFT)
American Psychiatric Association (APA)
American Psychiatric Nurses Association (APNA)
American Psychological Association (APA)
American School Counselor Association (ASCA)
Association for Addiction Professionals (NAADAC)
College of Psychiatric and Neurologic Pharmacists (CPNP)
Council on Social Work Education (CSWE)
National Board for Certified Counselors (NBCC)

The remainder of this module describes how HWSM models supply and demand for behavioral health providers.

Modeling supply

Supply modeling consists of the following steps:

Estimate the number and characteristics of the current supply
Model the number and characteristics of annual new entrants to supply
Model annual attrition from the behavioral health workforce
Model workforce behavior, such as hours worked patterns and geographic mobility

Estimating the base year workforce supply

The data sources for estimating starting supply in 2021, by state, are the following:

Psychologists: American Psychological Association for the de-duplicated state totals of licensed psychologists5
Addiction counselors, marriage and family therapists, social workers, and psychiatric technicians and aides: Bureau of Labor Statistics (BLS) Occupational Employment and Wage Statistics (OEWS)6 7 8
Mental health counselors: National Board for Certified Counselors (NBCC) for the de-duplicated state totals of licensed mental health counselors9
School counselors: Department of Education National Center for Education Statistics (NCES)10

The above data sources indicating the total number of licensed or active providers by state do not contain provider characteristics required for the HWSM microsimulation approach. To fill this gap, we used 2017-2021 ACS data which includes demographic information for each occupation.

We combined multiple years of ACS data to ensure a sufficient sample size in each state to draw a representative sample (with replacement) of the workforce population by demographic. The sample size equals the state-level estimates of licensed or active providers from the above data sources. For occupations with licensed provider counts, including psychologists, marriage and family therapists, and mental health counselors, we draw a random sample from all such providers (active and non-active) in the ACS. For occupations with active provider counts, including social workers, addiction counselors, and school counselors, we instead draw a random sample of “active” providers. For the ACS draw, “active” status is based on an employment status variable. Inactive respondents are those the ACS describes as “not in the labor force.”

For social workers, school counselors, marriage and family therapists, and mental health counselors, we sample from the population of those occupations in the ACS with an education level of master’s degree or higher.

HWSM uses a microsimulation modeling approach that simulates labor force participation decisions at the individual provider level. For modeling, we used the above data sources to create a database containing a simulated population of the behavioral health workforce in each state. This database has an individual record for each worker by occupation, state, age, sex, and race/ethnicity. HWSM uses this database as the starting point to project future supply.

Modeling new entrants

A simulated population for each occupation models yearly additions to the workforce. The simulated population reflects the annual graduates by demographics (Exhibit VIII-1).

We used the 2021 Integrated Postsecondary Education Data System (IPEDS) data to determine the number of annual new graduates for each behavioral health occupation, by sex and race. IPEDS collects the number of new graduates by sex, and race, for each Classification of Instructional Programs (CIP) code and degree level. We included only master’s degrees for the most appropriate CIP code in this analysis for all behavioral health occupations, except addiction counselors. The number of addiction counselors includes those with associate’s, bachelor’s, and master’s degrees.

To calculate the age distribution of new entrants to the workforce, we compared the number of providers of a particular age (e.g., age 29) in 2017-2021 ACS data to the number who were one year older (e.g., age 30) in the subsequent year’s file. The number of providers at age 30, above the number of providers at age 29, reflects the net number of new providers entering the workforce at age 29-30 in subsequent years of the survey. With this information, we can estimate the approximate age distribution of new entrants to the workforce. We used multiple years of data to increase the sample size by individual age and occupation. We also used the state distributions of providers aged 30-39 years to assign future new entrants in the model to a state.

Exhibit VIII-1: Sex, Race, and Age Distribution of Entering Behavioral Health Workers

Occupation	Annual Graduates ^a	Male(%) ^a	White ^a	Black ^a	Other ^a	Hispanic ^a	<25 ^b	26-30 ^b	31-40 ^b	>41 ^b
Psychologist	3,547	21	62	11	10	17	34	51	14	1
Mental health counselor	6,452	17	63	18	7	13	44	44	8	4
Marriage and family therapy/counselor	2,952	17	57	14	11	18	26	38	24	12
Substance abuse/addiction counselor	2,706	24	61	20	7	12	78	18	3	1
School counselor	11,175	17	60	12	7	21	37	52	8	3
Child, family, and school SW	15,717	13	55	19	8	18	32	42	10	16
Health care social worker	7,276	13	55	19	8	18	27	46	20	7
Mental health and substance abuse SW	9,150	13	55	19	8	18	26	39	25	10

Sources: ^a Analysis of the 2020 IPEDS program completions data. ^b Analysis of the 2017-2021 American Community Survey.

Modeling workforce participation

Workers licensed and/or trained and thus eligible to work as behavioral health providers may choose not to be in the workforce. Each simulation year, HWSM models the likelihood that a provider under age 50 becomes inactive and does not count as a full-time equivalent (FTE) in the supply. For active workers, HWSM calculates expected hours worked as described in the next section. Inactive providers under age 50 remain in the simulation, as they have a calculated probability of being active in subsequent years. This differs from attrition, where a person retires or permanently leaves the workforce.

Labor force participation rates for health care workers are calculated directly for individuals under age 50 using 2017-2021 ACS data. We use a logistic regression approach where the dependent variable is whether the person works at least one hour per week in their profession. Explanatory variables include age group, sex, and race/ethnicity. Separate regressions are estimated for each occupation.

Behavioral health providers can also leave the workforce of their current occupation permanently by changing careers. Each year, workers under age 50 have an estimated probability of being removed from the workforce based on observed career change using CPS Annual Social and Economic Supplement survey data. For addiction counselors, the sample size was too small for reliable estimates, so psychologists were used as a proxy for them. While these providers may join other health care occupations, we assume that they are captured in the new graduate data for that occupation.

For providers aged 50 years and over, we modeled the annual probability of retiring, with retirement probability increasing with age. Attrition patterns for each profession are based on 2017-2021 ACS data. These patterns are constructed based on a question asking whether the person is currently employed and whether they were employed last year. Health care workers, flagged for attrition, drop out of the supply entirely and do not return in later years. Attrition probabilities vary by occupation and age. The sample size in ACS is insufficient to model attrition by sex or race/ethnicity. Exhibit VIII-2 summarizes the cumulative probability that behavioral health providers will be active in the workforce after age 50.

Modeling hours worked

HWSM contains predictive equations of weekly hours worked, estimated by Ordinary Least Squares regression using 2017-2021 ACS data. We estimated separate regressions for each occupation. The dependent variable is total hours worked per week. Explanatory variables are provider age group (age <35, 35-44, 45-54, 55-59, 60-64, 65-69, and 70-74), sex, and race/ethnicity. ACS survey year is included as a set of explanatory variables to control for differences by year in the number of hours worked.

Exhibit VIII-3 and Exhibit VIII-4 summarize weekly hours worked for non-Hispanic White males and females, respectively, by provider age and occupation. Female providers tend to work slightly fewer hours per week than their male colleagues, on average. Older providers still active in the workforce work fewer hours than their younger colleagues. Average hours worked varies by provider race and ethnicity, with the race/ethnicity effect being small and differing by provider age group, sex, and occupation.

FTE supply projections account for changing demographics of the workforce and the average hours worked per week differs by age, sex, race, and occupation. We convert the expected number of hours worked by each individual to FTE supply by dividing the total person-hours worked by 40. This creates a uniform standard of 1 FTE as working 40 hours per week, regardless of the occupation. It also means that the initial FTE of an occupation will differ from the actual number of active providers.

Modeling state-level supply and migration

For occupations with sufficient state-level data, HWSM models future movement of behavioral health workers across states. In the ACS and OEWS, some occupations do not have totals reported in every U.S. state (particularly for less populated states and behavioral occupations with fewer workers). State-level supply estimates are unavailable for addiction counselors and social workers.

The model accounts for annual movement between states in two steps. First, logistic regression11 using 2017-2021 ACS data estimates the probability of a behavioral health provider under the age of 50 migrating to another state based on their age group, sex, the population of the state from which the person moved, and a year indicator. The assumption is that states with large populations have more opportunities for intra-state movements and thus experience fewer inter-state movements. Comparing each person’s move probability to a random number between 0 and 1 determines which providers move each year.

Second, the likelihood that each person who moves will relocate to a specific state is based on the proportion of providers in that occupation moving to that state, as observed in ACS data. The assigned new state is based on the distribution of destination states for individuals who moved in the 2012-2021 ACS data. The model uses more years of ACS data for this step because the number of ACS respondents in each occupation moving to smaller population states is low. For example, if 10% of psychologists who relocated according to ACS moved to California, then each psychologist who moves in the simulation has a 10% probability of moving to California. This approach ensures that cross-state migration has no impact at the national level in terms of the number and characteristics of modeled providers.

Supply scenarios modeled

The Status Quo scenario extrapolates current patterns of hours worked, attrition, and cross-state migration to behavioral health supply in future years.

Alternative supply scenarios model the sensitivity of future supply to changes in key assumptions. These alternative scenarios illustrate the uncertainty of behavioral health supply determinants changes over time. Two scenarios model a 10% increase and a 10% decrease in number of new providers trained each year, respectively. Two scenarios model if providers retire 2 years earlier or 2 years later, relative to current patterns. For example, under the early retirement scenario, a provider who would have retired at age 65 instead retires at age 63. Under the delayed retirement scenario, a provider who would have retired at age 65 instead retires at age 67.

In addition, we model a scenario projecting what current and future supply of behavioral health workers would have been if Behavioral Health Workforce Education and Training (BHWET) and Opioid Workforce Expansion Program (OWEP) had never been funded. This scenario removes from the starting supply the people who were in the workforce because of BHWET and OWEP funding.

Modeling demand

The approach to modeling demand for behavioral health providers follows the common model outlined in the other modules. The main demand components are (1) a constructed population file for each county in the U.S. with a representative sample of the population from 2021 through 2036, (2) prediction equations of the demand (i.e., annual expected use) for health care services, and (3) provider staffing ratios. This section provides additional details on modeling demand for behavioral health providers.

Adapting HWSM to model demand for behavioral health services and providers requires addressing data limitations. One major limitation is that the population database that underlies the model and the prediction equations for health care use lack variables related to mental health status and substance abuse.

The Behavioral Risk Factor Surveillance System (BRFSS) used to construct the population file for the community-based population does not collect data on respondents’ substance abuse status but does collects some information on mental health:

Now thinking about your mental health, which includes stress, depression, and problems with emotions, for how many days during the past 30 days was your mental health not good?
During the past 30 days, for about how many days did poor physical or mental health keep you from doing your usual activities, such as self-care, work, or recreation?
Because of a physical, mental, or emotional condition, do you have serious difficulty concentrating, remembering, or making decisions?

The Medical Expenditure Panel Survey (MEPS) used to develop prediction equations for health care use, also collects some information on mental health status:

Perceived mental health status: Excellent, Very Good, Good, Fair, Poor

For HWSM to include mental health status as a predictor for health care use, the same type of mental health status information needs to be collected by the surveys used to construct the population file (e.g., ACS or BRFSS) and the files used to model health care use (e.g., MEPS).

Patient characteristics included in HWSM are hypothesized to be correlated with receipt of mental health services. These include:

Demographics
Family income level
Presence of chronic disease
Insurance type (especially insured by Medicaid)
Lifestyle choices
Metropolitan/nonmetropolitan location
State of residency

A second data limitation is that recorded information on provider-patient encounters is unavailable for some behavioral health occupations. MEPS does contain information on ambulatory visits to psychologists and social workers (as well as to psychiatrists as discussed in the module on modeling the physician workforce). Because MEPS visits are based on data extraction from medical records, visits to social workers are likely to clinical social workers.

To model annual ambulatory (office and outpatient) visits to psychologists and social workers, we used negative binomial regression:

the dependent variable is the number of annual visits to a specific type of provider
the explanatory variables are:
- Demographics
- Lifestyle variables
- Family income
- Insurance information
- Presence of select chronic conditions
- Resident county level of rurality

MEPS does not specifically identify visits to mental health counselors, marriage & family therapists, or addiction counselors. These occupations are not differentiated in MEPS, but rather are listed under the “all other non-physician” category. Therefore, to construct prediction equations for patients’ annual use of ambulatory services for these occupations, we modeled the relationship between patient characteristics and total annual ambulatory behavioral health visits available in MEPS. Total visits include visits to psychiatrists, psychologists, social workers, and the “all other non-physicians” category, indicating a visit for mental health or substance abuse. Using this broad category of behavioral health visits assumes that patient characteristics correlated with a greater number of mental health visits (psychiatrists, psychologists, social workers, or other non-physicians) correlate with greater use of services provided by mental health counselors, marriage family therapists, and addiction counselors. Using projected total behavioral health visits as the workload driver overstates the actual number of visits to individual provider occupations. However, it serves as a scalar for the projected growth rate in demand and geographic variation in demand. The above prediction equations apply only to modeling services in provider office and outpatient settings. Different assumptions and prediction equations are used for modeling demand for these occupations in other care delivery or employment settings such as nursing homes, schools, etc.

Because HWSM contains no information on the use of illicit drugs, alcohol consumption, and mental health variables, such as presence or severity of depression, the predicted demand for behavioral health services for each individual will be biased toward the national average. We made a further adjustment to account for geographic variation in demand for addiction counselors.

As illustrated in Exhibit VIII-5, the prevalence of substance use disorder (SUD) varies across states for both adults and children. Publications based on the National Survey on Drug Use and Health (NSDUH) provide state averages for SUD prevalence for adults (age 18+) and adolescents (age 12-17). Due to sample size concerns, reported state prevalence estimates generally combine two years of data—such as the combined 2018-2019 surveys. For 2021, published state estimates from the NSDUH are from a model that uses small area estimation methods. Due to COVID-19-related concerns around data collection in 2020, we averaged the two state estimates reported that cover 2018-2019 and 2021.12 13 14

Among adults, SUD prevalence for the District of Columbia averages 1.457 times the national average, while Florida is 0.850 times the national average (Exhibit VIII-5). Among adolescents, SUD prevalence in New Mexico is 1.496 times the national average, while Utah is 0.723 times the national average. We use these state-level multiplicative scalars for adults and for children and adolescents to adjust demand up or down for addiction counselors to reflect state variation in SUD prevalence. While these scalars changed the state-level projections, the effect on national-level projections when projected to 2036 is small.

Exhibit VIII-5: Substance Use Disorder Prevalence by State, 2018-2021

	Percentage of Adults with SUD				Percentage of Children and Adolescents with SUD
State	2018-2019	2021	Average	Average vs National	2021	2020	Average	Average vs National
Alabama	7.89	16.36	12.12	96.7%	7.68	6.11	6.89	92.5%
Alaska	10.23	22.03	16.13	128.6%	10.43	5.06	7.74	104.0%
Arizona	7.11	17.39	12.25	97.7%	10.74	6.06	8.40	112.9%
Arkansas	7.16	16.14	11.65	92.9%	6.88	6.29	6.59	88.5%
California	9.23	17.09	13.16	104.9%	7.56	6.64	7.10	95.3%
Colorado	11.75	19.99	15.87	126.5%	10.97	6.37	8.67	116.5%
Connecticut	8.43	16.41	12.42	99.0%	8.70	7.50	8.10	108.7%
Delaware	8.79	17.91	13.35	106.4%	9.70	5.13	7.42	99.6%
District of Columbia	12.30	24.26	18.28	145.7%	9.77	3.94	6.86	92.1%
Florida	5.98	15.35	10.67	85.0%	7.32	5.99	6.65	89.4%
Georgia	6.60	17.06	11.83	94.3%	7.93	4.30	6.12	82.1%
Hawaii	8.45	14.19	11.32	90.3%	9.45	6.08	7.76	104.3%
Idaho	7.67	18.12	12.89	102.8%	8.52	7.06	7.79	104.7%
Illinois	8.02	17.07	12.54	100.0%	10.55	7.19	8.87	119.1%
Indiana	8.42	20.47	14.45	115.2%	8.49	6.49	7.49	100.6%
Iowa	8.05	19.62	13.84	110.3%	10.99	6.52	8.76	117.6%
Kansas	7.29	18.00	12.64	100.8%	8.15	9.05	8.60	115.5%
Kentucky	7.87	17.23	12.55	100.0%	7.43	6.59	7.01	94.1%
Louisiana	8.06	19.07	13.57	108.2%	10.77	6.00	8.38	112.6%
Maine	8.89	17.31	13.10	104.5%	8.58	7.46	8.02	107.7%
Maryland	7.01	18.77	12.89	102.8%	8.00	5.27	6.64	89.1%
Massachusetts	8.83	17.78	13.30	106.1%	9.73	6.77	8.25	110.8%
Michigan	7.56	17.80	12.68	101.1%	8.53	7.14	7.84	105.3%
Minnesota	7.62	17.87	12.75	101.6%	9.65	5.73	7.69	103.3%
Mississippi	7.15	17.47	12.31	98.1%	7.52	6.48	7.00	94.0%
Missouri	7.71	18.28	12.99	103.6%	9.46	6.81	8.14	109.3%
Montana	10.04	20.50	15.27	121.7%	10.32	8.60	9.46	127.0%
Nebraska	7.71	16.80	12.25	97.7%	8.40	7.13	7.76	104.2%
Nevada	9.32	19.73	14.53	115.8%	11.63	4.65	8.14	109.4%
New Hampshire	9.09	17.02	13.06	104.1%	6.58	7.46	7.02	94.3%
New Jersey	6.71	16.32	11.51	91.8%	7.45	7.26	7.36	98.8%
New Mexico	7.70	22.31	15.01	119.6%	14.52	7.75	11.14	149.6%
New York	7.43	17.51	12.47	99.4%	11.29	6.49	8.89	119.3%
North Carolina	7.26	16.36	11.81	94.2%	7.70	5.13	6.41	86.1%
North Dakota	8.88	21.53	15.21	121.2%	8.23	6.53	7.38	99.1%
Ohio	7.94	17.65	12.80	102.0%	9.22	6.81	8.01	107.6%
Oklahoma	8.01	19.67	13.84	110.4%	11.06	6.07	8.57	115.1%
Oregon	9.78	20.08	14.93	119.0%	12.53	7.97	10.25	137.7%
Pennsylvania	7.31	16.86	12.08	96.3%	7.87	6.85	7.36	98.8%
Rhode Island	8.95	19.13	14.04	111.9%	11.11	6.60	8.85	118.9%
South Carolina	6.73	15.54	11.14	88.8%	6.56	5.26	5.91	79.4%
South Dakota	7.69	17.01	12.35	98.5%	8.64	7.37	8.01	107.6%
Tennessee	7.22	17.76	12.49	99.6%	8.36	6.13	7.24	97.3%
Texas	6.48	15.78	11.13	88.7%	6.46	5.79	6.12	82.2%
Utah	6.56	15.52	11.04	88.0%	5.07	5.70	5.39	72.3%
Vermont	10.10	21.95	16.02	127.8%	12.35	7.91	10.13	136.0%
Virginia	7.33	17.32	12.33	98.3%	6.61	6.99	6.80	91.3%
Washington	8.62	18.75	13.68	109.1%	11.29	6.27	8.78	117.9%
West Virginia	6.29	16.66	11.48	91.5%	8.45	6.96	7.70	103.5%
Wisconsin	8.68	18.20	13.44	107.1%	9.41	5.66	7.54	101.2%
Wyoming	7.84	19.58	13.71	109.3%	8.55	6.90	7.73	103.8%
National	7.74	17.35	12.54	100.0%	8.55	6.34	7.45	100.0%

Source: Center for Behavioral Health Statistics and Quality. 2018-2019 National Survey On Drug Use And Health National Maps Of Prevalence Estimates, By State. Substance Abuse and Mental Health Services Administration; 2020. Accessed on September 1, 2023.

Center for Behavioral Health Statistics and Quality. 2021 NSDUH: Model-Based Estimated Prevalence For State, Table 25. Substance Abuse and Mental Health Services Administration; 2023. Accessed on September 1, 2023.

To model demand, HWSM estimates the FTE distribution of providers across employment settings, and projects FTE demand growth for each setting over time. Workload drivers are projected for each setting. Using national ratios of workload per FTE, HWSM then projects future demand for providers by setting.

National estimates of total FTE providers in each setting are based on the combined 2019 and 2021 ACS and the combined 2021 and 2022 OEWS (Exhibit VIII-6). The total FTE estimate incorporate estimated starting year shortfall across all the behavioral health occupations associated with increase in demand for services with COVID-19 becoming endemic. Like with other health occupations and as described in the module providing an overview of demand modeling, we model that COVID-19 becoming endemic increases demand for both hospital and outpatient care. For many occupations, the estimated increase in demand is 1% or less. For behavioral health, this is likely a conservative estimate of the increase in demand for behavioral health services.

Total workload measures were divided by FTE supply (plus starting year shortages) in 2021 to calculate staffing ratios by occupation and care delivery setting (Exhibit VIII-7). The Status Quo demand scenario models the continuation of current provider-to-visits ratios during the projection period. It also models state-level demand for services and providers by applying national patterns to the characteristics of each state’s population.

Exhibit VIII-6: Distribution of Behavioral Health Care Workers across Employment Settings, 2021

Distribution
Setting	Hospitals	Outpatient	Offices	Home Health	Nursing Home	Residential Care	Schools	Academia	Other	Total
Psychiatric technicians ^a	47%	10%	16%	0%	0%	13%	1%	0%	13%	100%
Psychiatric aides ^a	57%	4%	3%	0%	0%	11%	0%	0%	25%	100%
Psychologists ^b	5%	5%	13%	0%	0%	0%	67%	2%	8%	100%
Addiction counselors ^b	7%	46%	3%	1%	1%	6%	13%	2%	23%	100%
Mental health counselors ^b	9%	54%	4%	0%	1%	2%	2%	3%	26%	100%
School counselors ^b	0%	0%	0%	0%	0%	0%	100%	0%	0%	100%
Child, family, and school social workers ^b	1%	0%	0%	1%	1%	1%	27%	0%	69%	100%
Health care social workers ^b	11%	5%	2%	3%	4%	21%	0%	0%	55%	100%
Mental health and substance abuse social workers ^b	18%	33%	7%	0%	0%	2%	2%	1%	36%	100%
Marriage and family therapists ^b	4%	23%	7%	0%	0%	3%	1%	0%	61%	100%

Numbers of Providers
Setting	Hospitals	Outpatient	Offices	Home Health	Nursing Home	Residential Care	Schools	Academia	Other	Total
Psychiatric technicians	44,402	9,447	15,116	-	-	12,281	945	-	12,281	94,473
Psychiatric aides	22,521	1,580	1,185	-	-	4,346	-	-	9,878	39,511
Psychologists	5,765	5,106	13,925	-	-	60	73,964	2,702	8,484	110,005
Addiction counselors	7,698	53,828	3,429	761	673	6,782	14,909	1,803	26,369	116,252
Mental health counselors	9,994	61,738	4,176	-	942	2,376	2,377	2,917	29,759	114,280
School counselors	-	-	-	-	-	-	119,897	-	-	119,897
Child, family, and school social workers	1,299	-	-	929	952	1,813	35,866	-	90,023	130,882
Health care social workers	6,688	3,035	951	1,835	2,166	12,982	-	0	33,777	61,434
Mental health and substance abuse social workers	12,950	24,298	5,445	-	-	1,547	1,803	868	26,070	72,981
Marriage and family therapists	2,138	10,737	3,323	-	191	1,440	549	-	29,170	47,548

Note: Standardized FTE definition, 1 FTE= 40 hours/week; Numbers may not sum to 100% because of rounding. Total FTE estimates reflect estimated starting year shortfalls.

Employment Distribution Sources: ^a Bureau of Labor Statistics Occupational Employment and Wage Statistics, Combined 2021 and 2022. ^b Combined 2019 & 2021 ACS.

Exhibit VIII-7: Summary of Behavioral Health Profession Workload Drivers: U.S. Total 2021

Setting:	Hospitals	Outpatient	Offices	Home Health
Workload Metric:	Days	Visits	Visits	Visits
Psychiatric aides
Mental health counselors
Health care social workers
Mental health and substance abuse social workers
Psychiatric technicians	13,023,000	13,163,000	61,564,000	-
Psychologists	13,023,000	13,163,000	61,564,000	-	173,709,326	1,671,000	100,733,000	-
Addiction counselors	17,801,000	436,134,000	50,541,000
Marriage & family therapists			50,541,000	-
School counselors			-	-		-
Child, family, and school social workers	1,548,601	108,796,879	7,477,000

Staffing Ratios (National workload ÷ FTE providers)
Setting:	Hospitals	Outpatient	Offices	Home Health	Nursing Home	Residential Care	Schools	Academia	Other
Workload Metric	Days	Visits	Visits	Visits	Residents	Residents	Students	Graduates	Population
Psychiatric technicians	297	1,409	4,119	-	-	75	-	-	27,331
Psychiatric aides	584	8,407	52,431	-	-	213	-	-	33,919
Psychologists	29,763	323	7,145	-	-	15,094	717	12,920	38,639
Addiction counselors	21,600	317	121,755	63,611	1,711	129	3,448	18,764	12,049
Mental health counselors	16,189	269	97,270	-	1,189	359	21,036	11,282	10,387
Marriage & family therapists	69,701	1,422	112,603	-	5,416	545	83,972	-	9,762
School counselors	-	-	-	-	-	-	446	-	-
Child, family, and school social workers	130,487	-	-	7854	1,232	492	1,461	-	3,597
Health care social workers	25,762	506	113,409	4,042	551	70	-	-	9,746
Mental health and substance abuse social workers	12,614	60	18,790	-	-	556	28,013	38,273	11,972

Source: Projections for 2021 from HWSM.

Staffing Ratios based on FTE supply count for each health occupation. Final demand projections for all occupations scaled to supply FTEs defined as working 40 hours/week plus estimated starting year shortfalls.

Trends in mental health care use

The results from the National Health Interview Survey (NHIS) provide annual estimates for the variables “Received counseling/therapy from mental health professional, past 12 months” since 2019 and an equivalent variable for “Seen/talked to mental health professional, past 12 months” for prior years. The survey question for the former was “During the past 12 months, did you receive counseling or therapy from a mental health professional such as a psychiatrist, psychologist, psychiatric nurse, or clinical social worker?” For the latter, the survey question was “During the past 12 months, have you seen or talked to any of the following health care providers about your own health? ... A mental health professional such as a psychiatrist, psychologist, psychiatric nurse, or clinical social worker”. Information about the sample child is collected from a parent or adult who is knowledgeable about and responsible for the health care of the child.

The survey collects and reports data of the above variables for adults (aged 18 and over) and children and adolescents (aged 2-17). Exhibit VIII-8 shows the percentages of mental health counseling usage for adults, children, and a combined sample of adults and children. Data were extracted from the “Sample Adult File” and “Sample Child File” and were weighted using the respective sample weights. Unknowns were excluded in the calculations of the denominators. The proportion of adults utilizing mental health counseling has increased from 7.75% in 2010 to 9.51% in 2019 and 12.64% in 2022. The proportion of children utilizing mental health counseling has increased from 7.06 percent in 2010 to 8.42% in 2019 and 11.74% in 2022. The proportions for the combined adults and children sample are 7.60%, 9.28%, and 12.45% for 2010, 2019, and 2022, respectively. Although there are some fluctuations, there is an upward trend overtime.

Exhibit VIII-8: Percentages of Mental Health Counseling for Adults and Children: 2010-2022

Year	Adults	Children	Adults & Children
2010	7.75%	7.06%	7.60%
2011	7.95%	7.62%	7.88%
2012	7.74%	8.18%	7.84%
2013	7.55%	7.14%	7.46%
2014	7.14%	7.26%	7.17%
2015	8.00%	8.66%	8.14%
2016	8.48%	8.68%	8.52%
2017	9.01%	8.88%	8.98%
2018	10.04%	9.49%	9.93%
2019	9.51%	8.42%	9.28%
2020	10.06%	10.54%	10.16%
2021	11.15%	9.57%	10.82%
2022	12.64%	11.74%	12.45%

Using the data from 2010 to 2022, Exhibit VIII-9 shows the trends for both adults and children. A linear trendline through 2036 is estimated. The linear model seems to fit the data better than other models that we tested (including logarithmic and power functions), and it has the highest adjusted R-squared value. We also found the forecasted values from the linear model to be reasonable.

We also analyzed trends using 2010-2019 data, excluding the survey results from 2020-2022. The National Center for Health Statistics (NCHS) of the Centers for Disease Control and Prevention (CDC), which conducts the survey, cautions against comparing values after 2019 with values from 2019 and prior, as the mode of data collection changed from fully in-person to mixed (including in-person and web). This is because the composition of the people differs between modes of data collection and also that in-person respondents are more likely to have higher SUD and mental health issues. The period 2019 and prior are also pre-COVID-19. While excluding the years 2020 and after may have the aforementioned advantages, it excludes the significant increases in the mental health use that happened in the past couple of years. With the last three year’s data excluded, the trend gets less steep, and the explanatory power of the estimated equation diminished. For this reason, we use the 2010 to 2022 data to estimate the trends.

Similarly, a linear trendline is estimated for children and adolescents (Exhibit VIII-10), and for children, adolescents, and adults combined (Exhibit VIII-11).

Adjustment scalars

The linear trendlines using the 2010-2022 NHIS data will be applied. Based on the trendlines, the following scalar adjustment factors, shown in Exhibit VIII-12, were calculated and are applied to each projection year (2021-2036). The scalar values are indexes calculated as a ratio of the forecasted utilization in a given future year to the forecasted utilization in 2021.

The adults figures are applied to adult psychiatrist projections, while the children scalars are applied to the projections for child psychiatrists and school counselors. The adults & children scalars, calculated for a combined group of adults and children, are applied to the projections for the remaining behavioral health occupations.

Exhibit VIII-12: Demand Adjustment Scalars: 2021 through 2036

Year	Adults	Children	Adults & Children
2021	100.00%	100.00%	100.00%
2022	103.41%	103.01%	103.35%
2023	106.81%	106.03%	106.69%
2024	110.22%	109.04%	110.04%
2025	113.63%	112.05%	113.38%
2026	117.03%	115.06%	116.73%
2027	120.44%	118.08%	120.07%
2028	123.85%	121.09%	123.42%
2029	127.26%	124.10%	126.77%
2030	130.66%	127.11%	130.11%
2031	134.07%	130.13%	133.46%
2032	137.48%	133.14%	136.80%
2033	140.88%	136.15%	140.15%
2034	144.29%	139.16%	143.49%
2035	147.70%	142.18%	146.84%
2036	151.10%	145.19%	150.19%

Demand scenarios modeled

As with other health occupations modeled, HWSM models the demand for behavioral health providers under a Status Quo scenario and a Reduced Barriers scenario, as described in other modules. Both scenarios assume that current demand is equal to supply at the national level plus a conservative estimate of unmet demand associated with COVID-19 becoming endemic. Additionally, the demand for psychiatrists starts at 6,851 active psychiatrists higher than supply to reflect the number of providers required to remove all mental health professional shortage area (HPSA) designations.15 These two scenarios extrapolate current levels of care into the future, with the Reduced Barrier scenario modeling greater access to care.

For the behavioral health workforce, we model three additional Unmet Needs demand scenarios based on the assumption that current supply is inadequate to meet population needs.16 “An unmet mental health need exists when someone has a mental health problem but doesn’t receive formal care, or when the care received is insufficient or inadequate."17 The Reduced Barriers and Unmet Needs scenarios are consistent with HRSA’s strategic plan to “address health disparities through access to quality services.”18 This scenario also illustrates the wide disparities in use of behavioral health services. Modeling this scenario helps quantify the additional workforce required to meet Substance Abuse and Mental Health Services Administration's (SAMHSA) aim to improve behavioral health equity, which is defined as “the right to access quality health care for all populations regardless of the individual’s race, ethnicity, gender, socioeconomic status, sexual orientation, geographical location, and social conditions through prevention and treatment of mental health and substance use conditions and disorders.”19

The following is a brief description of each scenario:

The Status Quo scenario models a continuation of recent (2015-2019) national patterns of care use extrapolated to the future population. This scenario captures geographic variation in demographics, health risk factors, disease prevalence, insurance coverage, level of rurality, and household income that can affect demand for behavioral health services. Similarly, the scenario captures population growth and aging—and the associated implications for disease prevalence and other health risk factors—over the projection horizon. The scenario evaluates whether the nation’s future behavioral health workforce is sufficient to provide at least the current level of care. It also includes a conservative estimate of unmet need and increase in demand associated with COVID-19 becoming endemic.
The Reduced Barriers scenario estimates the number of FTEs required if populations that historically faced barriers to accessing behavioral health services demonstrated care use patterns comparable to populations perceived to have fewer barriers to accessing care. The scenario modifies the health care use patterns of nonmetropolitan county residents, racial and ethnic minority populations, and people without health insurance to the health care use patterns of their peers living in metropolitan counties, who are non-Hispanic White, and who have health insurance. Each of the three components of this scenario (non-metropolitan versus metropolitan county of residence, minority versus non-Hispanic White, and uninsured versus insured) is modeled in isolation and together to quantify the magnitude of each factor on demand for services. This hypothetical scenario describes the implications for behavioral health provider demand if policies and programs reduced access-based disparities to health care services. The impact of reducing barriers to accessing care is modeled only for care provided in ambulatory settings and hospital settings. Demand projections for behavioral health services delivered in nursing homes and residential care facilities equal those of the Status Quo scenario.
This scenario helps quantify the impact of each factor when a certain level of change of each factor is expected. For example, when a proportion of uninsured population is expected to be covered by insurance, a rough estimate on the impact to the demand for the health workforce can be proportionally developed.
The Unmet Needs 1 scenario models a lower-bound assumption that 12.3% of the nation’s behavioral health needs are currently unmet among adults with any mental illness (AMI) or adolescents with a major depressive episode (MDE). The National Institute of Mental Health (NIMH) reports that there were 57.8 million adult Americans (aged 18 and older) with AMI in 2021 (Exhibit VIII-13).20 This amounts to approximately 22.8% of the U.S. adult population. NIMH findings from the 2021 National Survey on Drug Use and Health (NSDUH) show that less than half of adults with AMI received treatment (26.5 million). This implies that 31.3 million adults with AMI did not receive treatment in 2021. This amounts to approximately 12.3% of the U.S. adult population.
While NIMH does not provide data on adolescents (aged 12 to 17) with AMI, it reports on adolescents that had an MDE in the past 12 months. In 2021, 5.0 million adolescents reported having had an MDE in the past 12 months, of which 40% (2.0 million adolescents) received treatment. This implies 3.0 million did not receive treatment. Combining the data for adults and adolescents suggests that the percentage of the population aged 12 and above that have a mental health need but who received no services is approximately 12.3%.
The 12.3% estimate of unmet needs under this scenario is likely a lower bound for unmet needs, as it only counts people with mental health issues who received no services. This estimate omits people with mental health issues who received some services but perceive the level of services insufficient to meet all their mental health needs. This estimate also omits estimates of unmet need for substance abuse issues.

Exhibit VIII-13: U.S. Total Adults and Adolescents with Mental Health Issues, 2021

Parameter	Count (in millions)	Percent of Population
U.S. Population aged 18 and above ^a	253.8	100.0%
Adults with AMI	57.8	22.8%
Received Treatment	26.5	10.4%
Did Not Receive Treatment	31.3	12.3%
U.S. Population aged 12 to 17 ^b	26.0	100.0%
Adolescents with MDE	5.0	19.2%
Received Treatment	2.0	7.7%
Did Not Receive Treatment	3.0	11.5%
U.S. Population aged 12 and above	279.8	100.0%
Adults with AMI and adolescents with MDE	62.8	22.4%
Received Treatment	28.5	10.2%
Did Not Receive Treatment	34.3	12.3%

Source: The Substance Abuse and Mental Health Services Administration (SAMHSA, 2021)21 ^aTable A.29B (page 32), Figure 50 (page 44), ^b Figure 46 (page 41). Population figures from online supplemental tables (Table 12.1A).

The Unmet Needs 2 scenario models the assumption that 19.9% of the nation’s behavior health needs are currently unmet among adults and adolescents with mental health and substance abuse issues. In addition to data on adults and adolescents with mental health needs and treatment services, NSDUH also collects data on substance abuse issues, along with data on treatment services for 2021.22
The percentage of treatment for co-occurring illicit drugs and alcohol use disorder and AMI is used as proxy for percentage of treatment for co-occurring SUD and AMI since the latter is not reported in the 2021 NSDUH report. Among 935,000 adolescents aged 12 to 17 in 2021 with a co-occurring SUD and an MDE in the past year, 56.1% (or 524,535) received either substance use treatment at a specialty facility or mental health services in the past year, 52.4% (or 489,940) received only mental health services, and 3.6% (or 33,660) received both SUD treatment at a specialty facility and mental health services. This implies that a total of 34,595 received SUD treatment, while 900,405 adolescents with co-occurring SUD and MDE didn’t receive treatment for SUD.
Among the 19.4 million adults aged 18 or older in 2021 with a co-occurring SUD and AMI in the past year, 52.5% (or 10.19 million) received either substance use treatment at a specialty facility or mental health services in the past year, 44.1% (or 8.56 million) who received only mental health services, 1.4% (or 271,000) who received only substance use treatment at a specialty facility, and 6.6% (or 1.28 million) who received both substance use treatment at a specialty facility and mental health services (Exhibit VIII-14). This implies a total of 1.55 million of adults with co-occurring SUD and AMI received SUD treatment, while 17.85 million received no SUD treatment.
The analysis above suggests 55.6 million Americans with AMI/MDE or SUD, or both did not receive treatment in 2021. Given a total U.S. population aged 12 and above of 279.8 million, that implies that about 19.9% of the adult and adolescent population had an unmet need for mental health or substance abuse treatment.
Note, unmet need for adolescent mental health is estimated for adolescents that suffered one or more MDE during the prior 12 months. This definition is different from AMI, which was reported for adults. As such, the above estimates should be thought of as approximations.

Exhibit VIII-14: U.S. Total Adults and Adolescents with Mental Health Issues and Substance Use Disorder, 2021

AMI/SUD Status	Count (in millions)			Percent Untreated		Count Untreated
AMI/SUD Status	Adults	Adolescents	Total	Adults	Adolescents	Adults	Adolescents	Total
AMI/MDE^a only	38.4	4.1	42.5	-	49.0%	22.1 ^b	2.0	24.1
SUD only	24.7	1.2	25.9	-	67.9%	21.1 ^c	0.8	21.9
AMI/MDE^a & SUD	19.4	0.9	20.3	47.5%	43.0%	9.2	0.4	9.6
Total	82.5	6.3	88.8	-	-	-	-	55.6

Notes: Numbers might not sum to totals due to rounding.^a Numbers for adults with AMI and adolescents with MDE.^b Estimated as 31.3 million adults with AMI that did not receive treatment less 9.2 million adults with AMI and SUD that did not receive treatment. ^c Estimated as 40.7 million adults and adolescents with SUD that did not receive treatment less 0.8 million adolescents with SUD only, 0.4 million adolescents with AMI and SUD, and 17.9 million adults with AMI and SUD that did not receive treatment.

Source: SAMSHA (2021)23 Figure 33 (page 33), Figure 35 (page 34), Figure 54 (page 48), and Table A.60B (page A-78). Population figures from online supplemental tables (Table 12.1A).

The Elevated and Unmet Needs scenario combines the increase in demand estimated by the Reduced Barriers scenario with the unmet needs estimated by the Unmet Needs 2 scenario. It incorporates the ideas that historically underserved populations and communities would use more behavioral health services if barriers to receiving care were removed, but also that the level of services used by the reference population (i.e., non-Hispanic white, insured, and living in a metropolitan area) may also increase to meet unmet needs.

The rationale for modeling the above demand scenarios is that the health system continues to improve access to and comprehensiveness of behavioral health services. These trends include:

Better affordability through increased coverage by insurance
More intensive use of screening
Efforts to decrease stigma
Better understanding of how to address behavioral health issues
Increased integration of primary care and behavioral health
Greater use of team-based care with a broader range of behavioral health providers that provides opportunities for task shifting and providing a more comprehensive range of behavioral health services
Greater use of technology such as telemedicine to reduce barriers to accessing care in rural areas and improve care to patients with mental health needs in emergency departments, nursing facilities, and other employment settings

Historically, the unmet needs gap was modeled at 20%, reflecting a likely lower bound on the true level of unmet need.24 25 However, there are several caveats with the unmet needs estimates used in the scenarios described above.

These estimates are based on adults and adolescents who self-report their behavioral health conditions and having received any services. The NSDUH does not clinically evaluate whether the services received are sufficient or whether perceived unmet needs are necessary. Adults with AMI who receive no services possibly have lower mental health needs, on average, as compared to adults with AMI who receive some services or who received services but still perceive having an unmet need.26 27 People with serious mental illness (SMI) who perceive having unmet needs may be more likely to require a greater level of additional care than those with AMI who perceive having unmet needs.
Estimates of behavioral health needs for children under age 12 are not collected in the NSDUH, though any downward bias in the national numbers of unmet behavioral needs is likely to be small.
Even within the behavioral health workforce, the level of unmet need likely varies by occupation. For example, the unmet needs estimate for addiction counselors may differ from the unmet needs estimate for mental health providers.
There is some evidence that unmet need has increased with the COVID-19 pandemic.28 The prevalence of anxiety or a depressive disorder among adults has increased and the percentage of adults reporting an unmet mental health need increased between August 2020 and February 2021. The workforce projections extrapolate an increasing prevalence in behavioral health disorders based on the trends in percentage of adults and children seeking mental health counseling observed from 2010 through 2022.

Date Last Reviewed:

October 2023

1 Substance Abuse and Mental Health Services Administration. "FindTreatment.gov." SAMHSA. Published April 27, 2022. Accessed August 17, 2022.
2 Health Resources and Services Administration. "Behavioral Health Workforce Projections." U.S. Department of Health and Human Services; 2018.
3 Health Resources and Services Administration. National Projections of Supply and Demand for Selected Behavioral Health Practitioners: 2013-2025 (PDF - 451 KB)." United States Department of Health and Human Services; 2016.
4 Health Resources and Services Administration. "National Projections of Supply and Demand for Selected Behavioral Health Practitioners: 2013-2025 (PDF - 451 KB)." U.S. Department of Health and Human Services; 2016.
5 Lin L, Conroy J, Christidis P. "Which states have the most licensed psychologists?" Monitor on Psychology; 2020. Accessed July 22, 2020.
6 Bureau of Labor Statistics, U.S. Department of Labor. Occupational Outlook Handbook: Psychiatric Technicians and Aides. Bureau of Labor Statistics, U.S. Department of Labor; 2020.
7 Bureau of Labor Statistics, U.S. Department of Labor. Occupational Outlook Handbook: Substance Abuse, Behavioral Disorder, and Mental Health Counselors. Bureau of Labor Statistics, U.S. Department of Labor; 2020.
8 Bureau of Labor Statistics, U.S. Department of Labor. Occupational Outlook Handbook: Community and Social Service Occupations. Bureau of Labor Statistics, U.S. Department of Labor; 2020.
9 National Board for Certified Counselors. Personal communication regarding state estimates of de-duplicated licensed mental health counselors, 2022.
10 National Center for Education Statistics. Common Core of Data - CCD Data Files. National Center for Education Statistics; 2020. Accessed September 16, 2020.
11 Marshall G. Logistic Regression. Encyclopedia.com. Published May 14, 2018. Accessed September 23, 2022.
12 Center for Behavioral Health Statistics and Quality. 2018-2019 National Survey On Drug Use And Health National Maps Of Prevalence Estimates, By State (PDF - 4 MB). Substance Abuse and Mental Health Services Administration; 2020. Accessed on September 1, 2023.
13 Center for Behavioral Health Statistics and Quality. 2021 NSDUH: Model-Based Estimated Prevalence For State, Table 25. Substance Abuse and Mental Health Services Administration; 2023. Accessed on September 1, 2023
14 Center for Behavioral Health Statistics and Quality. 2021 NSDUH: Model-Based Estimated Prevalence For State, Table 25. Abuse and Mental Health Services Administration; 2023.
15 Bureau of Health Workforce. "Designated Health Professional Shortage Areas Statistics: Fourth Quarter of Fiscal Year 2021." Health Resources and Services Administration; 2021.
16 Christidis P, Lin L, Stamm K. An unmet need for mental health services. Monitor on Psychology. 2018;49(4):19. Accessed July 23, 2019.
17 Rens E, Dom G, Remmen R, Michielsen J, Van den Broeck K. Unmet mental health needs in the general population: perspectives of Belgian health and social care professionals. International Journal for Equity in Health. 2020;19(1):169.
18 Health Resources and Services Administration. Strategic Plan FY 2019-2022. U.S. Department of Health and Human Services; 2019. Accessed June 8, 2020.
19 Substance Abuse and Mental Health Services Administration. Behavioral Health Equity. U.S. Department of Health and Human Services; 2019.
20 SAMSHA. Key Substance Use and Mental Health Indicators in the United States: Results from the 2021 National Survey on Drug Use and Health, pages 55 and 58 (PDF - 2 MB). Population figures from online supplemental tables (Table 9.1A) Accessed August 1, 2023.
21 SAMSHA. Key Substance Use and Mental Health Indicators in the United States: Results from the 2021 National Survey on Drug Use and Health (PDF - 2 MB). Pages 55 and 58. Population figures from online supplemental tables (Table 9.1A).
22 Substance Abuse and Mental Health Services Administration. 2021 NSDUH Annual National Report. U.S. Department of Health and Human Services; 2023. Accessed August 1, 2023.
23 Substance Abuse and Mental Health Services Administration. 2020 NSDUH Annual National Report." U.S. Department of Health and Human Services; 2021. Accessed September 24, 2022.
24 Health Resources and Services Administration. National Projections of Supply and Demand for Selected Behavioral Health Practitioners: 2013-2025 (PDF - 451 KB). U.S. Department of Health and Human Services; 2016.
25 Center for Behavioral Health Statistics and Quality, Substance Abuse and Mental Health Services Administration. 2017 National Survey on Drug Use and Health: Detailed Tables. Substance Abuse and Mental Health Services Administration; 2018.
26 Han B, Compton WM, Blanco C, Colpe LJ. Prevalence, Treatment, And Unmet Treatment Needs Of US Adults With Mental Health And Substance Use Disorders. Health Affairs. Published online October 12, 2017. Accessed May 2, 2018.
27 Walker ER, Cummings JR, Hockenberry JM, Druss BG. Insurance Status, Use of Mental Health Services, and Unmet Need for Mental Health Care in the United States. Psychiatric Services. Published online March 1, 2015.
28 Vahratian A, Blumberg SJ, Terlizzi EP, Schiller JS. Symptoms of Anxiety or Depressive Disorder and Use of Mental Health Care Among Adults During the COVID-19 Pandemic — United States, August 2020–February 2021. MMWR Morb Mortal Wkly Rep. 2021;70(13):490-494.