Residential Mental Health and Substance Abuse Facilities (NAICS 623220)

A Histometrics industry primer for public-market and private investors.

1. Overview

This industry runs the places people live in, around the clock, while being treated for a mental-health condition or a substance use disorder (SUD): residential addiction "rehab," psychiatric residential treatment centers (RTCs) for adults and teens, halfway and sober-living houses, eating-disorder residences, and group homes for people who cannot yet live independently. The defining feature is that clients sleep there and receive room, board, supervision, and counseling — as distinct from a doctor's office they visit, or a licensed hospital where medical care is the primary service.[1] (NAICS is the North American Industry Classification System, the federal code that defines the industry.)

It is a bed-based, labor-intensive service business: revenue depends on occupied beds, clinical staffing, referrals, payer contracts, and collections. Demand is large, chronic, and rising, and it is increasingly paid for by insurance and Medicaid rather than out of pocket — but the field is intensely fragmented, labor-constrained, and under sharpening regulatory and reputational scrutiny. Owning the right facility with the right payer mix and high occupancy can earn attractive returns; the wrong one bleeds cash.

How investors reach it differs by type. There is no clean public "pure play": the two large listed operators — Acadia Healthcare and Universal Health Services — straddle this code and the adjacent psychiatric-hospital code, and most of their beds are in licensed hospitals rather than in residential facilities.[8][9] The genuinely residential slice is dominated by nonprofits, private-equity-backed roll-ups, and government agencies. Public investors get mostly indirect exposure; private investors get it directly, by owning, financing, or providing real estate to facilities.

Investor judgment: demand is a durable secular tailwind, but returns hinge on compliance, staffing, payer economics, and local execution far more than on national industry growth alone.

2. What it is and how it's structured

Scope (what NAICS 623220 covers). The Census Bureau defines it as establishments providing residential care and treatment — room, board, supervision, counseling, rehabilitation, and related social services — for mental-health or substance-use conditions, where any medical service is secondary to counseling and support.[1] Typical facilities:

• Residential alcohol and drug rehabilitation facilities (that are not licensed hospitals)
• Psychiatric convalescent homes and mental-health RTCs (including youth programs)
• Halfway houses and sober-living homes for people with mental illness or addiction
• Group homes for emotionally disturbed adults or children

What it explicitly EXCLUDES — this matters for reading the public companies:

• Psychiatric and substance-abuse hospitals (licensed inpatient hospitals) sit in NAICS 622210. Most of Acadia's and UHS's beds are here, not in 623220.[8][9]
• Outpatient mental-health and SUD clinics, including many methadone/opioid-treatment programs, sit in NAICS 621420.
• Physician and therapist offices sit in NAICS 621112 / 621330.
• Residences for intellectual and developmental disability sit in the sibling code NAICS 623210.
• Nursing care (623110), continuing-care retirement / assisted-living (623311, 623312), temporary shelters (624221), and correctional institutions (922140) are all separate.[1]

Ownership mix. This is not a Wall Street sector at its core. Across all SUD treatment facilities nationally, roughly 48% are nonprofit, 43% for-profit, and 9% government; across mental-health facilities the tilt is even more nonprofit — about 63% nonprofit, 19% for-profit, 18% government (2022 federal facility survey).[5] Only about 24% of SUD facilities offer any residential care at all — the rest are outpatient — so the residential niche is a minority of an already fragmented field.[5] Note also that federal business data does not cleanly separate publicly traded companies from privately held ones, so there is no reliable "public vs. private" revenue split for this specific code.[2]

3. How big it is

U.S. federal business statistics for NAICS 623220 (reference years differ, so treat this as a profile, not a single-year income statement):

(CBP = County Business Patterns, the Census establishment survey; HHI is a standard 0–10,000 concentration index; SBA is the U.S. Small Business Administration.)

Read the concentration numbers: the four largest firms take under 10% of revenue, the top 50 barely a quarter, and the HHI of 36 (where anything under 1,500 is "unconcentrated") is about as fragmented as a U.S. industry gets.[3] Thousands of small operators, each with a handful of facilities, make up the bulk. Low national concentration does not rule out strong local or specialty concentration, which is where competition actually happens.

The undercount caveat. These figures materially understate the real footprint of residential behavioral care. CBP counts only employer establishments and excludes businesses with no paid employees and most government employees; the Economic Census likewise centers on private employer firms.[2][5] That misses two big pieces: government-run psychiatric and SUD residences (government owns roughly one in ten SUD residences and nearly one in five mental-health ones)[5], and the long tail of tiny nonprofit, faith-based, and owner-run halfway and sober-living homes. Broader third-party market estimates that fold in more of this activity put the wider "mental-health and substance-abuse centers" market nearer $30 billion (2024), and the entire U.S. behavioral-health market (outpatient and hospitals included) around $95–97 billion.[23] Treat the ~$21 billion federal receipts figure as the reliable floor for the residential-only slice, not the ceiling for the treatment economy. Industry-wide occupancy, margin, and return-on-capital figures are not published in the federal data — investors should not substitute broad healthcare averages for facility-level underwriting.

4. The investable universe

There is no pure public play in residential behavioral care. The listed names below are the closest exposure, but much of their revenue comes from hospitals (NAICS 622210) and outpatient clinics (NAICS 621420) rather than from this code.

Major private and other owners (where the residential market actually lives):

• Private-equity-backed platforms: Discovery Behavioral Health (announced in 2026 that funds managed by HPS Investment Partners would take majority ownership through a debt-restructuring transaction — a reminder that leverage cuts both ways)[20]; Newport Healthcare (teens/young adults; Onex Partners took majority control in 2021)[21]; plus Odyssey Behavioral Healthcare, Summit BHC, Pinnacle Treatment Centers, Recovery Centers of America, and American Addiction Centers.[7]
• Large nonprofits: Hazelden Betty Ford, Caron, Rogers Behavioral Health, Sheppard Pratt, Phoenix House, Gaudenzia, Odyssey House.
• Government: state and county behavioral-health authorities operating public residences.

Private equity's (PE) overall share is still modest — about 6.2% of mental-health and 7.1% of SUD facilities nationally (2024) — but concentrated: in Colorado, Texas, and North Carolina PE holds roughly a quarter of facilities, and about 60% of behavioral-health mergers-and-acquisitions (M&A) deals since 2018 involved a PE buyer.[7]

5. How the money works

Residential facilities are a beds × occupancy × price business, closer in shape to a hotel or skilled-nursing home than to a physician practice. The core revenue identity:

Revenue ≈ occupied bed-days × collected rate per patient-day, plus ancillary clinical and contractual revenue.

The operating metrics owners actually watch (and that Acadia reports as core measures — patient days, admissions, average length of stay, revenue per patient-day, same-facility results)[8]:

• Occupancy / census. Fixed costs (real estate, minimum clinical staffing, licensing) are high, so profitability is highly sensitive to how full the beds are. Insurance-dependent centers often need 85–90%+ occupancy to make money; push much above ~95% and care quality and staff retention suffer.[22]
• Average length of stay (ALOS). Longer authorized stays spread fixed cost over more revenue-days. Payers push the other way, authorizing fewer days — the central tension of the model.
• Reimbursement per patient-day (the per-diem). Private insurance commonly pays roughly $300–$800 per day for residential care; a 30-day private program often runs $25,000–$50,000, and luxury/private-pay programs far more.[22]
• Denials, collections, and referral concentration. Authorization and denial rates, accounts-receivable aging, and reliance on a few referral sources make or break the same-facility numbers.
• Payer mix — the single biggest driver of margin. Three streams behave very differently: 1. Private / commercial insurance — higher rates, but many premium residential centers bill out-of-network, which is lucrative, volatile, and increasingly contested. 2. Medicaid and government block grants — lower rates, but steady, high-volume, and expanding; the roll-up/volume model lives here. 3. Private pay / self-pay — the luxury-rehab and teen-RTC segment, marketing-driven and high-margin, but demand swings with the economy.

Two distinct business models fall out of this. The private-pay / out-of-network residential model (destination rehabs, eating-disorder and adolescent RTCs) is admissions-marketing-intensive and high-margin per patient but exposed to referral volatility and payer disputes. The Medicaid-funded community model (community residences and opioid programs) is a volume play with thin per-unit margins that scales through consolidation and steady public reimbursement. Acadia has leaned into the second — building and buying dozens of Medicaid-reimbursed opioid clinics as a recurring-revenue engine.[8]

Cost structure: labor dominates — salaries, wages, and benefits were 52.4% of Acadia's 2024 revenue (a company-specific figure, not an industry median)[8] — followed by occupancy (owned or leased real estate), professional fees, supplies, insurance, food, and utilities. Because labor is both the largest cost and the scarcest input, wage inflation and staffing shortages hit margins directly. New facilities also carry a ramp: Acadia says a de-novo facility typically takes 10–12 months to reach break-even.[8]

6. What drives demand

• Prevalence and unmet need. Behavioral-health need is enormous and largely unmet. In 2023, 20.4 million U.S. adults had both a substance use disorder and a mental illness, and 7.7 million received neither mental-health nor substance-use treatment during the year.[14] Residential beds serve the acute end of that gap and the step-down after hospitalization.
• The overdose crisis — improving but still elevated. Final 2024 data recorded 79,384 U.S. drug-overdose deaths, down 26.2% from 2023.[15] That is genuine public-health progress (driven partly by wider naloxone and treatment access), but it does not remove the underlying, structurally high SUD treatment need.
• Insurance coverage expansion. Federal parity law and Medicaid have progressively shifted payment from out-of-pocket to third-party, enlarging the paying population.[10]
• Medicaid policy unlocking residential coverage. Medicaid's long-standing "Institution for Mental Diseases" (IMD) exclusion generally bars federal Medicaid payment for adults 21–64 in behavioral facilities with more than 16 beds — but since 2015, states using Section 1115 waivers have been able to cover SUD and serious-mental-illness residential stays, materially expanding the reimbursable market.[16]
• Youth, child-welfare, and telehealth funneling. Child-welfare placements, employer demand, reduced stigma, and telehealth screening that refers patients up into residential care all feed admissions.
• Supply constraint as a demand backstop. Most of the U.S. population lives in a federally designated mental-health workforce-shortage area.[6] Because the binding constraint is often staff, not patients, a well-run facility rarely lacks demand — but a person in need becomes revenue only if a bed is open, staffing is adequate, the payer authorizes care, and the provider collects.

7. Regulation

Residential behavioral care is one of the more heavily governed corners of health care, and oversight is mostly state-based:

• State licensing. Every facility is licensed by a state health or behavioral-health authority; rules on bed capacity, staffing ratios, seclusion/restraint, involuntary holds, and permitted services vary widely by state.[6]
• Accreditation. The Joint Commission and CARF International (the Commission on Accreditation of Rehabilitation Facilities) accredit facilities; accreditation is often a condition of insurer and Medicaid participation.
• Youth PRTF benefit. Psychiatric residential treatment facilities (PRTFs) serving people under age 21 can qualify for a dedicated Medicaid benefit but must hold an active state Medicaid provider agreement and meet federal safety requirements.[17]
• The IMD exclusion and 1115 waivers (see Demand) are the pivotal federal payment rules for adult residential coverage.[16]
• Federal parity. The Mental Health Parity and Addiction Equity Act (MHPAEA) requires that behavioral coverage be no more restrictive than medical/surgical coverage. A tightened 2024 final rule targeted non-quantitative limits — utilization management, facility type, provider networks, and access to intermediate levels of care — but is now in litigation-driven abeyance: regulators have said they will not enforce the new provisions while the case is pending, leaving the enforcement environment unsettled.[10]
• Opioid-specific rules. Programs dispensing methadone/buprenorphine are governed by SAMHSA and DEA regulation (42 CFR Part 8), and behavioral records carry extra confidentiality protection (42 CFR Part 2). (SAMHSA = Substance Abuse and Mental Health Services Administration; DEA = Drug Enforcement Administration; CFR = Code of Federal Regulations.)
• Youth-facility oversight is tightening. After years of abuse allegations against the "troubled-teen" residential industry — documented by the Government Accountability Office (GAO)[19] — Congress passed the Stop Institutional Child Abuse Act (2024), mandating recurring federal study of youth residential programs, and California enacted the Accountability in Children's Treatment Act (2024) to increase transparency.[18]
• Fraud and quality enforcement. The Department of Justice (DOJ) actively polices medically-unnecessary billing and staffing failures under the False Claims Act (see Risks).[11][13]

8. Competitive dynamics and consolidation

The industry is structurally fragmented and consolidating slowly. With a CR4 under 10% and an HHI of 36, no operator has pricing power at the national level.[3] Durable advantage comes instead from local referral relationships, payer-network participation and credentialing (scale helps across state lines), qualified clinicians and low turnover, specialized programs and outcomes data, real-estate control, and revenue-cycle/compliance infrastructure.

Consolidation runs on three tracks: strategic operators (Acadia, UHS) buying facilities and building new beds and clinics; private-equity roll-ups aggregating regional platforms; and joint ventures in which national operators partner with hospital systems to co-develop behavioral facilities. Acadia explicitly names acquisitions, joint ventures, de-novo facilities, and bed additions as its growth channels.[8] Countervailing pressure comes from the durable nonprofit and government presence, which is largely not for sale and caps how consolidated the field can become. Private deals (Newport, Discovery) show platform consolidation continues — but Discovery's debt-restructuring transaction also shows how quickly leverage can turn.[20][21]

A recurring policy-relevant finding: research indicates PE-owned residential facilities tend to charge more (15%+ higher) and offer fewer ancillary services than other for-profit peers — a dynamic drawing attention that could shape future rules on ownership disclosure and rates.[7]

9. Risks

• Regulatory and reputational — the headline risk. Acadia paid a $19.85 million federal settlement in September 2024 over allegations of medically-unnecessary inpatient billing and staffing failures, and faced press scrutiny (including a New York Times investigation) over holding patients against their will, with further federal inquiries following.[11][12] Earlier, in 2020, UHS and related entities paid $122 million to resolve False Claims Act allegations involving medically-unnecessary services and kickbacks (settled without a determination of liability).[13] Scandal at one operator can trigger payer and regulatory scrutiny across the sector.
• Reimbursement and policy risk. Medicaid rate cuts, eligibility "redeterminations" that disenroll patients, out-of-network billing crackdowns (including the No Surprises Act, the federal law limiting surprise out-of-network bills), the unsettled parity rule, and IMD policy all threaten revenue. A large share of residential revenue depends on discretionary utilization-management decisions by payers.
• Workforce. Chronic shortages of counselors, psychiatric nurses, therapists, and behavioral-health technicians constrain how many beds can operate and push wages up — the most persistent margin pressure in the model.[8]
• Clinical, safety, and litigation. Providers serve vulnerable patients; the GAO has flagged continuing concerns over youth placements, restraints, medication, monitoring, and fragmented oversight.[19] A serious incident can hit licensure, referrals, payer contracts, hiring, and financing all at once.
• Occupancy and referral volatility. Empty beds create operating leverage in reverse; loss of a major referral source, payer contract, or specialty program can cut census fast. Private-pay and out-of-network centers are especially exposed to marketing-driven admissions swings.
• Capital and leverage. New construction, leases, acquisitions, and working capital create large fixed obligations before a facility reaches stable occupancy — and PE-owned platforms carry added debt and policy-backlash risk.

10. How to invest, and the outlook

Public-market routes. The cleanest listed exposure is Acadia Healthcare (ACHC), the largest pure behavioral operator, followed by Universal Health Services (UHS), where behavioral is a large division inside a broader hospital company.[8][9] Investors wanting the real estate rather than the operations can look at Universal Health Realty Income Trust (UHT), a REIT landlord — though it is small and heavily tied to a single tenant.[9] There is no ETF or listed company that isolates residential behavioral care, and the two operators' beds skew toward licensed hospitals, so public buyers get a blend of hospital, residential, and outpatient economics — not a residential pure play. The diligence items that matter: residential revenue share, occupancy and patient-day growth, payer mix and Medicaid exposure, labor cost, liability reserves, compliance history, and cash conversion — not just total-company revenue.

Private-market routes — where most of this specific industry actually is:

• Direct operating ownership of facilities or regional platforms (the PE roll-up model), betting on occupancy, payer-mix upgrades, and multiple expansion on exit.
• Behavioral-health real estate — net-leased facility property leased to operators — a lower-operational-risk way to own the asset base. Separate the real-estate return from the operating-company return.
• Private credit to operators and platforms.
• Site-level diligence is the real work: verify every license and payer contract; test historical occupancy and denial rates; review staffing ratios, turnover, and agency-labor use; analyze referral concentration; validate outcomes and incident reporting; and underwrite working capital, maintenance capital, leases, and debt.
• Note that the nonprofit and government majority of the field is not investable in the conventional sense; capital concentrates in the for-profit minority.

Outlook (forward-looking judgment). The demand backdrop is a genuine secular tailwind: high, largely unmet behavioral-health need, parity enforcement (whenever it settles), and Medicaid 1115 waivers steadily converting unpaid need into reimbursable volume.[10][14][16] Against that, three forces are likely to cap returns and reward operational quality over financial engineering: a hard labor ceiling, reimbursement and Medicaid-policy uncertainty, and an intensifying regulatory-and-reputational spotlight — on billing practices, on youth facilities, and on private-equity ownership.[7][11][18] The plausible path is continued slow consolidation of a fragmented field, with the winners being operators that pair a durable payer mix (increasingly Medicaid at scale) with clean compliance, reliable staffing, and local density. Near-term watch items: resolution of the MHPAEA parity rule, Medicaid rate and eligibility policy, Acadia's trajectory post-settlement, and how the new youth-facility oversight regime is implemented.

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Sources

1. U.S. Census Bureau. North American Industry Classification System (NAICS) 2022 — 623220, Residential Mental Health and Substance Abuse Facilities (definition, scope, and excluded adjacent codes). https://www.census.gov/naics/?input=623220&year=2022
2. U.S. Census Bureau. County Business Patterns 2023 (NAICS 623220: establishments, employment, annual and Q1 payroll; excludes nonemployers and most government). https://data.census.gov/table/CBP2023.CB2300CBP?naics=62322
3. U.S. Census Bureau. 2022 Economic Census — Concentration of Largest Firms (NAICS 623220: receipts, firms, CR4/CR8/CR20/CR50, HHI). https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
4. U.S. Small Business Administration. Table of Small Business Size Standards (2023; NAICS 623220 = $19M receipts). https://data.sba.gov/dataset/small-business-size-standards
5. KFF. "A Look at Substance Use and Mental Health Treatment Facilities Across the U.S." (2022 N-SUMHSS data; ownership mix and share offering residential care). 2024. https://www.kff.org/mental-health/a-look-at-substance-use-and-mental-health-treatment-facilities-across-the-u-s/
6. SAMHSA. National Substance Use and Mental Health Services Survey (N-SUMHSS): 2023 (facility inventory, licensing/certification, state oversight). 2024. https://www.samhsa.gov/data/data-we-collect/n-sumhss-national-substance-use-and-mental-health-services-survey
7. Behavioral Health Business. "Private Equity Owns 6.2% of Mental Health, 7.1% of Addiction Treatment Facilities" (and PE pricing/ancillary-service findings; ~60% of deals since 2018 PE-backed). 2024. https://bhbusiness.com/2024/05/01/private-equity-owns-6-2-of-mental-health-7-1-of-addiction-treatment-facilities/
8. Acadia Healthcare Company, Inc. Form 10-K for the year ended December 31, 2024 (262 behavioral facilities / ~11,850 beds; RTCs = 11% of revenue; salaries-wages-benefits 52.4%; ~10–12-month de-novo break-even; growth channels). 2025. https://www.sec.gov/Archives/edgar/data/1520697/000095017025029095/achc-20241231.htm
9. Universal Health Services, Inc. Form 10-K for the year ended December 31, 2024 (behavioral division scale and facilities; UHT REIT relationship); HCA Healthcare Form 10-K FY2024 for adjacent hospital-based behavioral exposure. 2025. https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000352915&type=10-K
10. U.S. Department of Labor / CMS. "Mental Health and Substance Use Disorder Parity — 2024 Final Rule" and subsequent non-enforcement (abeyance) statement. 2024–2025. https://www.cms.gov/newsroom/press-releases/departments-health-labor-treasury-issue-final-rules-strengthening-access-mental
11. U.S. Department of Justice. "Acadia Healthcare Company Inc. to Pay $19.85M to Settle Allegations Relating to Medically Unnecessary Inpatient Behavioral Health Services." 2024. https://www.justice.gov/archives/opa/pr/acadia-healthcare-company-inc-pay-1985m-settle-allegations-relating-medically-unnecessary
12. Behavioral Health Business. "Acadia Healthcare Faces Scrutiny Over Patient Holds" (following New York Times investigation and continued federal inquiries). 2024. https://bhbusiness.com/2024/09/03/acadia-healthcare-faces-scrutiny-over-patient-holds/
13. U.S. Department of Justice. "Universal Health Services Inc. and Related Entities to Pay $122 Million to Settle False Claims Act Allegations." 2020. https://www.justice.gov/archives/opa/pr/universal-health-services-inc-and-related-entities-pay-122-million-settle-false-claims-act
14. SAMHSA. Key Substance Use and Mental Health Indicators: 2023 National Survey on Drug Use and Health (NSDUH) (20.4M adults with co-occurring SUD + mental illness; 7.7M untreated). 2025. https://www.samhsa.gov/data/report/2023-nsduh-annual-national-report
15. Centers for Disease Control and Prevention (CDC), National Center for Health Statistics. 2024 U.S. drug-overdose deaths: 79,384, down 26.2% from 2023. 2026. https://www.cdc.gov/nchs/pressroom/nchs_press_releases/
16. Medicaid.gov / Congressional Research Service. "Behavioral Health Services — the Institution for Mental Diseases (IMD) exclusion and Section 1115 SUD waivers." https://www.medicaid.gov/medicaid/benefits/behavioral-health-services/parity; https://www.congress.gov/crs_external_products/IF/HTML/IF10222.html
17. Centers for Medicare & Medicaid Services (CMS). "Psychiatric Residential Treatment Facility (PRTF) Providers." 2025. https://www.cms.gov/medicare/health-safety-standards/certification-compliance/psychiatric-residential-treatment-facility-providers
18. Stop Institutional Child Abuse Act (2024) — see NBC News, "Paris Hilton-backed bill to study the troubled-teen industry clears Congress," 2024 (https://www.nbcnews.com/news/us-news/paris-hilton-bill-congress-troubled-teen-industry-rcna181632); California Accountability in Children's Treatment Act (2024), Office of the Governor of California.
19. U.S. Government Accountability Office (GAO). Child Welfare: Abuse of Youth Placed in Residential Facilities. 2024. https://www.gao.gov/products/gao-24-107625
20. Discovery Behavioral Health. "New Majority Ownership and Leadership Appointments" (funds managed by HPS Investment Partners; >100 programs across 12 states). 2026. https://www.prnewswire.com/news-releases/discovery-behavioral-health-announces-new-majority-ownership-leadership-appointments-302788985.html
21. Onex Corporation. "Onex Partners Completes Majority Investment in Newport Healthcare." 2021. https://www.onex.com/article/2021NewsRelease-OnexCompletesNewportHealthcare-July19
22. Per-diem and occupancy economics: Behave Health, "Per Diem Rate — Glossary" (https://behavehealth.com/glossary/per-diem-rate); La Hacienda Treatment Center, "Inpatient Rehab Facility Cost Per Day" (https://www.lahacienda.com/blog/inpatient-rehab-facility-cost-per-day). 2024–2026.
23. Third-party market-size estimates (broader behavioral-health market context): IBISWorld, "Mental Health & Substance Abuse Centers in the US" (https://www.ibisworld.com/united-states/market-size/mental-health-substance-abuse-centers/1597/); Precedence Research, "U.S. Behavioral Health Market" (https://www.precedenceresearch.com/us-behavioral-health-market); Becker's Behavioral Health, "The U.S. behavioral health market, 2025 to 2034." 2024–2025.