Psychiatric and Substance Abuse Hospitals (U.S.) — NAICS 622210

An investor's primer. NAICS (the North American Industry Classification System) code 622210 covers hospitals licensed to provide inpatient medical treatment for mental illness and substance use disorders.

1. Overview

This industry is the inpatient, hospital-grade tier of behavioral health: locked and unlocked facilities that admit people in acute psychiatric crisis — suicidality, psychosis, severe depression — or for medically supervised detoxification and stabilization from drug and alcohol dependence. These are hospitals, not counseling centers: they keep licensed beds, serve meals, and staff physicians, psychiatric nurses, and behavioral technicians around the clock.[1]

The reason the category matters is a persistent mismatch: demand is large, structurally rising, and unusually recession-resistant, yet the supply of psychiatric beds is chronically short and the business is shaped at almost every turn by government payers and government rules. That combination — durable demand plus tightly regulated reimbursement — is what makes the industry both attractive and risky.

There are two ways in. Public-market investors have a narrow, mostly diversified set of choices: a handful of listed hospital operators, of which one is a near pure-play behavioral-health company and the others fold psychiatric beds into larger businesses. Private-market investors reach the industry more directly — buying facilities, backing private-equity (PE) platforms, lending through private credit, owning the real estate, or partnering with nonprofit and community-hospital systems. A very large share of the actual beds, however, sits with owners no investor can buy: state and county governments, the U.S. Department of Veterans Affairs (VA), and nonprofit health systems. The investment outcome depends less on demand alone than on reimbursement quality, staffing, occupancy, patient safety, licensing, and disciplined expansion.

2. What it is and how it's structured

NAICS 622210 comprises establishments licensed as psychiatric or substance-abuse hospitals, primarily providing diagnostic, medical, and monitoring services to inpatients, with an organized medical staff and beds for extended stays. Typical services include acute inpatient psychiatry, detoxification, dual-diagnosis care (treating mental illness and addiction together), and adolescent and specialty treatment.[1]

What the code excludes matters as much as what it includes, because the classification turns on a facility's principal activity:

• General medical and surgical hospitals (NAICS 622110) — including the psychiatric units inside them. A large share of U.S. psychiatric admissions happen in these units, not in standalone psychiatric hospitals, and they are counted elsewhere.[1]
• Other specialty hospitals (NAICS 622310) that are not psychiatric or substance-abuse hospitals.[1]
• Residential mental-health and substance-abuse facilities (NAICS 623220) — "rehab" and residential treatment where the emphasis is counseling and a supervised living environment rather than hospital-grade medical care.[1]
• Outpatient mental-health and substance-abuse centers (NAICS 621420) and offices of mental-health practitioners (NAICS 621330) — clinics, methadone/opioid-treatment programs run on an outpatient basis, and therapist practices.[1]

Because large operators commonly span several of these codes, reported company figures rarely equal strict 622210 exposure.

Ownership is unusually three-sided:

• Government (state, county, and federal/VA) hospitals — historically the backbone of the system and still holding a large share of beds, though shrinking. In standalone psychiatric facilities, the government-owned share of beds fell from about 64% in 2011 to roughly 48% in 2023.[6]
• Nonprofit and academic hospitals — names such as McLean (Mass General Brigham), Sheppard Pratt, Menninger (Baylor), and Rogers Behavioral Health.
• For-profit chains — the fastest-growing segment, whose share of standalone psychiatric beds rose from about 11% in 2011 to 27% in 2023.[6]

3. How big it is

Federal statistics measure the industry with two different lenses, from two different releases and years:

SBA is the U.S. Small Business Administration; the threshold below sets the ceiling under which a firm counts as "small" for federal programs.

Read the two lenses carefully, because the undercount is real but specific. County Business Patterns (CBP) is an employer-based series that normally excludes government establishments — but it makes an explicit exception for hospitals. So its establishment (751), employment (232,220), and payroll counts capture public as well as private psychiatric hospitals and are relatively complete for the hospital tier.[2][5] The 2022 Economic Census, by contrast, excludes government-owned establishments, so its receipts ($29.1 billion) and firm count (403) cover only private for-profit and nonprofit operators. Because state and county governments still own roughly half of standalone psychiatric beds,[6] the $29.1 billion in receipts materially understates the revenue of the full system, and the true number of psychiatric hospitals across all owners is higher than the 403 private firms. Treat the receipts and firm counts as the private-market size, not the whole system. (The concentration ratios below carry the same caveat.)

The Herfindahl-Hirschman Index (HHI) — a standard measure of market concentration — is suppressed in the federal data for this code, so no HHI value is available.[3]

For broader context, the total behavioral-health services market — including the outpatient clinics and residential facilities that sit in the adjacent NAICS codes above — is several times larger than the hospital slice measured here.[34]

4. The investable universe

No listed company is a pure-play, code-only 622210 operator; every public company combines psychiatric hospitals with outpatient, residential, general-hospital, or other services. Public exposure is also remarkably concentrated — one specialist plus a diversified operator run the great majority of investor-owned behavioral beds.

There is no meaningful pure-play psychiatric-hospital exposure beyond ACHC and UHS. Other large hospital operators (HCA, Tenet) run psychiatric units inside general hospitals, but those units are a small part of the company and are classified under general hospitals (NAICS 622110), not here.

Major private and non-listed owners — where most direct, facility-level exposure lives:

• Government and quasi-public: state mental-health authorities, county systems, and the VA — the largest bed owners in aggregate.
• Nonprofit / academic: McLean, Sheppard Pratt, Menninger, Rogers Behavioral Health, and community-hospital joint ventures.
• For-profit / PE-backed platforms: Lifepoint Behavioral Health, whose majority acquisition of Springstone added 18 behavioral hospitals and 35 outpatient locations across nine states;[15] Summit BHC, owned by Patient Square Capital;[16] Oceans Healthcare, backed by Webster Equity Partners, whose 2025 acquisition of Haven Behavioral Healthcare expanded it to 48 facilities across nine states and about 4,000 employees;[17][18] Signature Healthcare Services, a private operator of 19 freestanding acute psychiatric hospitals;[19] plus Discovery Behavioral Health, Odyssey Behavioral Healthcare, and dozens of platform and add-on deals in adjacent outpatient and residential care.[31][32]

The private market is therefore broader than the public-company universe and often offers more direct facility-level exposure.

5. How the money works

An inpatient psychiatric hospital earns revenue mainly on a per-day (per diem) basis: roughly patient days × net revenue per patient day, or equivalently admissions × revenue per admission, supplemented by ancillary services and any outpatient or residential programs. The core operating levers:

• Occupancy (beds filled ÷ beds available) — the single biggest swing factor. Costs are largely fixed to the bed count, so incremental admissions drop through to profit; conversely, low occupancy spreads fixed staffing and facility costs over fewer patient days.
• Average length of stay (ALOS) — psychiatric stays run days to a few weeks, longer than most medical admissions.
• Net revenue per adjusted patient day / per adjusted admission — the operators' core pricing metric.

Payer mix drives the rate. Revenue splits across Medicaid, commercial insurance, Medicare, self-pay, and government contracts, and behavioral care skews more toward government payers than general-hospital care. As one concrete (operator-wide, not industry-wide) illustration, Acadia's 2025 payer mix was 57.7% Medicaid, 24.6% commercial insurance, 14.3% Medicare, and 3.4% other.[9] The reimbursement mechanics:

• Medicare pays under the Inpatient Psychiatric Facility Prospective Payment System (IPF PPS) — a standardized federal per-diem rate adjusted for patient diagnosis, age, comorbidities, and facility factors such as rural location, teaching status, and area wages.[21]
• Medicaid is constrained by the IMD exclusion (see Regulation), a structural limit on federal payment for many adult inpatients.[22]
• Commercial insurers generally pay the most per day, so a richer commercial mix is a margin tailwind.

Costs are labor-dominated. The largest expense is people — psychiatrists, nurses, therapists, and behavioral technicians — so wage inflation and reliance on expensive contract (agency) staffing are the main cost risks. Staffing is simultaneously a cost and a capacity constraint: too little staffing caps admissions and creates safety, quality, and regulatory risk. Crucially, psychiatric hospitals need far less capital equipment than acute-care hospitals (no operating rooms, imaging suites, or ICUs), which has historically let well-run behavioral operators earn higher operating margins than general hospitals.

Growth comes from adding beds, not raising prices. Because a filled bed is highly profitable, the primary growth engine for the scaled operators is capacity: expanding beds at existing hospitals, building new (de novo) facilities, forming joint ventures (JVs) with nonprofit health systems that supply patients and a local brand while the operator supplies management, and acquisitions. New facilities, though, require substantial upfront capital and time to reach stable utilization.

6. What drives demand

Demand is deep and structurally rising. The 2024 National Survey on Drug Use and Health (NSDUH), from the Substance Abuse and Mental Health Services Administration (SAMHSA), reported:[7]

• 61.5 million U.S. adults (23.4%) with any mental illness, and 14.6 million (about 5.6%) with serious mental illness.
• 48.4 million people aged 12 or older with a past-year substance-use disorder (SUD), and 21.2 million adults with co-occurring mental illness and SUD.
• A large treatment gap: only 12.3% of people aged 12+ with an SUD received substance-use treatment (87.7% did not), and 41.2% of adults with co-occurring conditions received neither mental-health nor substance-use treatment.

Additional drivers:

• Overdose burden. Drug-overdose deaths, though falling sharply — an estimated 80,391 in 2024, down about 27% from roughly 110,000 in 2023 — remain very high and keep detox and dual-diagnosis demand elevated.[8] Overdose trends can shift demand among acute hospitalization, detox, medication treatment, residential, and outpatient care.
• Youth and young-adult mental health, where illness rates are highest,[7] is a growing admission source.
• Bed shortage. Chronic under-supply means patients "board" for hours or days in general-hospital emergency rooms — direct evidence that demand exceeds capacity and that new beds fill quickly.
• Coverage, parity, and public funding. Broader insurance coverage, enforcement of mental-health parity (below), the 988 crisis line, and crisis-stabilization investment all channel more people into the acute-care system.

The important caveat: high prevalence creates a large addressable need, but it does not automatically become inpatient revenue. Patients may be treated outpatient or in residential settings, lack coverage, face authorization barriers, or be cared for in public and nonprofit systems.

7. Regulation

This is a heavily regulated industry, and rule changes move earnings and the ability to open, expand, or acquire facilities.

• Medicare IPF PPS. The Centers for Medicare & Medicaid Services (CMS) sets the per-diem rate annually. For fiscal year 2026, CMS's final rule raised IPF payment rates by 2.5% and projected total IPF payments to rise about 2.4% (roughly $70 million); facilities that fail to report required quality data take a 2.0-percentage-point payment cut.[20][21]
• Medicaid IMD exclusion. Federal Medicaid generally will not pay for care in an "Institution for Mental Diseases" (IMD) — a psychiatric facility with more than 16 beds — for adults aged 21–64. This decades-old rule is the single biggest structural constraint on inpatient psychiatric economics. It has been partially relaxed: the 2018 SUPPORT Act (a federal opioid-response law) and state Section 1115 waivers now let states pay for some IMD care, especially for SUD.[22]
• EMTALA. The Emergency Medical Treatment and Labor Act requires Medicare-participating hospitals with emergency services to screen and stabilize emergency patients (including psychiatric emergencies) regardless of ability to pay — an area where for-profit psychiatric operators have drawn scrutiny for turning away or improperly holding patients.[23][24]
• MHPAEA. The Mental Health Parity and Addiction Equity Act generally bars health plans from applying more restrictive financial requirements or treatment limits to behavioral benefits than to medical/surgical benefits.[25] Tighter enforcement is a demand tailwind but also a compliance and litigation arena; a 2025 federal non-enforcement notice delayed new requirements from the 2024 MHPAEA final rule, though the underlying parity statute remains in force.[26]
• Privacy of substance-use records. The Health Insurance Portability and Accountability Act (HIPAA) and 42 Code of Federal Regulations (CFR) Part 2 protect patient information; the Department of Health and Human Services began civil enforcement of the Part 2 substance-use-records provisions on February 16, 2026.[27] Revised 42 CFR Part 8 rules also updated opioid-treatment-program (OTP) requirements, including more patient-centered medication for opioid-use disorder (MOUD).[28]
• State law. Licensure, accreditation (Joint Commission, CMS conditions of participation), staffing rules, involuntary-commitment (civil-commitment) statutes, and Certificate of Need (CON) laws that gate the creation of new beds. As of January 2025, 35 states and Washington, D.C., operated CON programs, with coverage and requirements varying by state.[29]

8. Competitive dynamics and consolidation

On the federal data the industry looks fragmented: 403 private firms, with the four largest accounting for only 21.4% of 2022 revenue, the top eight 26.2%, the top twenty 38.0%, and the top fifty 53.5% — leaving nearly half of revenue outside the largest fifty.[3] But those ratios understate concentration in the investor-owned, standalone segment, where UHS and Acadia are the two national platforms and for-profit chains have been steadily taking bed share from a retreating government sector (for-profit share of standalone psychiatric beds up from ~11% to ~27% between 2011 and 2023).[6]

Consolidation runs on three tracks: (1) the public chains adding beds and buying facilities; (2) JVs with nonprofit health systems; and (3) heavy private-equity roll-up of the adjacent outpatient and residential segments — PE firms deployed more than $20 billion into behavioral health between 2018 and 2025[32] and owned roughly 6.2% of U.S. mental-health and 7.1% of addiction-treatment facilities as of mid-2023.[31] Scale helps with payer contracting, clinician recruitment, centralized billing, compliance, purchasing, and the ability to fund new beds — but psychiatric care stays intensely local, so referral networks, transportation, state licensing, and physician coverage can matter more than national brand. Payers and regulators have begun scrutinizing PE ownership more closely, and quality failures, labor shortages, or CON restrictions can make consolidation slower and costlier than a simple roll-up thesis assumes.

9. Risks

• Reimbursement and policy. Earnings hinge on government rates. Medicaid funding cuts, adverse IPF PPS updates, or a tightening rather than loosening of the IMD exclusion would pressure margins directly. Annual Medicare updates that only modestly outpace cost inflation cap upside.
• Labor. Shortages of psychiatrists, nurses, therapists, and technicians, plus wage inflation and reliance on contract staffing, can compress margins quickly and cap admissions.
• Volume softness. Demand is deep but not automatic — UHS reported behavioral volume falling short of plan during 2025, a reminder that admissions can stall even in a growing market.[33]
• Quality, legal, and reputational risk — acute in this industry. For-profit psychiatric operators have faced sustained investigative reporting and litigation over patient safety, understaffing, elopement and suicide, restraint/seclusion events, and allegations of admitting or holding patients longer than medically necessary to bill payers.[24] Acadia paid $19.85 million in 2024 to settle federal and state whistleblower claims over medically unnecessary inpatient services (no admission of wrongdoing).[30] These cases carry financial, regulatory, and franchise risk.
• Payer pushback. Utilization management, prior authorization, and claim denials by commercial insurers can shorten length of stay and cut revenue per admission.
• Expansion and capital risk. Construction delays, CON requirements, referral ramp-up, physician recruitment, integration missteps, and high lease, real-estate, and debt costs can all impair returns on new beds.
• Classification and data risk. Federal business statistics do not capture the full behavioral-health continuum and understate government-linked activity, so top-down sizing can mislead.

10. How to invest, and the outlook

Public routes. Direct listed exposure means Acadia Healthcare (ACHC) as the near pure-play behavioral specialist, Universal Health Services (UHS) as the diversified operator with the largest behavioral footprint, and HCA Healthcare (HCA) as a general-hospital investment with only incidental psychiatric exposure.[9][11][13] There is no dedicated psychiatric-hospital fund; diversified investors get thin, incidental exposure through broad healthcare and hospital ETFs (exchange-traded funds). Because the pure-play universe is effectively two operators, single-name and policy risk are hard to diversify away — a point underscored by Acadia's equity falling roughly 64% during 2025 amid volume, litigation, and reimbursement concerns, which left its market value near $2 billion in early 2026.[14]

Private routes. Private capital reaches the industry through PE behavioral platforms, direct or JV partnership with operators, specialty behavioral-health real estate (owning the buildings and leasing to operators), and private credit to operators expanding capacity. The largest bed pools — government and nonprofit — remain outside investable channels. Facility-level diligence should center on available and licensed beds, occupancy, patient days, length of stay, net revenue per patient day, payer and contract mix, authorization/denial rates, staffing stability and physician coverage, quality and litigation history, licensure and CON exposure, capital needs, leases, debt, and exit alternatives.

Outlook. The demand backdrop is structurally favorable: rising diagnosed prevalence, large treatment gaps, parity enforcement, chronic bed shortages, and public crisis-care funding all point to durable volume growth, with bed additions the clearest earnings lever for scaled operators. Against that, the headwinds are real and mostly policy- and execution-driven — Medicaid budget pressure, modest annual reimbursement updates, a tight and expensive clinical labor market, and intensifying legal and regulatory scrutiny of for-profit inpatient practices. The plausible read is a durable, operationally demanding healthcare business with a strong secular tailwind but a low policy- and headline-risk ceiling: attractive long-run demand, capped and complicated by who pays and how closely they are watching.

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Sources

1. U.S. Census Bureau, 2022 NAICS Definition — 622210 Psychiatric and Substance Abuse Hospitals (scope and exclusions), 2022. https://www.census.gov/naics/?details=622210&input=622210&year=2022
2. U.S. Census Bureau, County Business Patterns: 2023, NAICS 622210 (establishments, employment, payroll), 2025. https://www.census.gov/data/datasets/2023/econ/cbp/2023-cbp.html
3. U.S. Census Bureau, 2022 Economic Census — Concentration of Largest Firms (receipts, firm count, CR4/CR8/CR20/CR50, HHI suppressed), NAICS 622210, 2025. https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN?codeset=naics~622210
4. U.S. Small Business Administration, Table of Size Standards (NAICS 622210 = $47 million average annual receipts), 2023. https://www.sba.gov/document/support-table-size-standards
5. U.S. Census Bureau, County Business Patterns Methodology (employer-based coverage; government-establishment exception for hospitals), 2026. https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html
6. Columbia University Mailman School of Public Health, Large For-Profit Chains Gain Share of Psychiatric Hospital Inpatients, 2025. https://www.publichealth.columbia.edu/news/large-profit-chains-gain-share-psychiatric-hospital-inpatients
7. Substance Abuse and Mental Health Services Administration (SAMHSA), Key Substance Use and Mental Health Indicators: Results from the 2024 National Survey on Drug Use and Health, 2025. https://www.samhsa.gov/data/sites/default/files/reports/rpt56287/2024-nsduh-annual-national/2024-nsduh-annual-national.htm
8. CDC National Center for Health Statistics, U.S. Overdose Deaths Decrease Almost 27% in 2024 (est. 80,391 in 2024), 2025. https://www.cdc.gov/nchs/pressroom/releases/20250514.html
9. Acadia Healthcare, 2025 Form 10-K (facility and bed counts, payer mix), 2026. https://www.sec.gov/Archives/edgar/data/1520697/000119312526078266/achc-20251231.htm
10. Acadia Healthcare, Fourth Quarter 2024 Results (2024 revenue), 2025. https://acadiahealthcare.gcs-web.com/news-releases/news-release-details/acadia-healthcare-reports-fourth-quarter-2024-results
11. Universal Health Services, 2025 Form 10-K (behavioral-division operating statistics), 2026. https://www.sec.gov/Archives/edgar/data/352915/000119312526071676/uhs-20251231.htm
12. Universal Health Services, 2024 Fourth Quarter and Full Year Financial Results (total and behavioral-segment net revenue), 2025. https://www.prnewswire.com/news-releases/universal-health-services-inc-announces-2024-fourth-quarter-and-full-year-financial-results-and-2025-operating-results-forecast-302386507.html
13. HCA Healthcare, 2025 Annual Report to Shareholders (behavioral hospitals and beds), 2026. https://s23.q4cdn.com/949900249/files/doc_financials/2024/ar/HCA-2025-Annual-Report-to-Shareholders-FINAL.pdf
14. CompaniesMarketCap, Market Capitalization of Acadia Healthcare (ACHC), 2026. https://companiesmarketcap.com/acadia-healthcare/marketcap/
15. Lifepoint Health, Lifepoint Health Acquires Majority Ownership Interest in Springstone, 2023. https://www.lifepointhealth.net/news/2023/02/07/lifepoint-health-acquires-majority-ownership-interest-in-springstone
16. Patient Square Capital, Summit BHC (portfolio), 2021. https://patientsquarecapital.com/portfolio/summit-bhc/
17. Oceans Healthcare, Oceans Healthcare Acquires Haven Behavioral Healthcare, Inc., 2025. https://oceanshealthcare.com/news/oceans-healthcare-acquires-haven-behavioral-healthcare-inc/
18. Webster Equity Partners, Oceans Healthcare (portfolio), 2026. https://websterequitypartners.com/portfolio/oceans-healthcare/
19. Signature Healthcare Services, About SHC, 2026. https://signaturehc.com/about
20. Centers for Medicare & Medicaid Services, FY 2026 Inpatient Psychiatric Facility PPS and Quality Reporting Updates Final Rule — Fact Sheet, 2025. https://www.cms.gov/newsroom/fact-sheets/fy-2026-inpatient-psychiatric-facility-prospective-payment-system-ipf-pps-quality-reporting
21. Centers for Medicare & Medicaid Services, Inpatient Psychiatric Facility PPS — Overview, 2025. https://www.cms.gov/medicare/payment/prospective-payment-systems/inpatient-psychiatric-facility
22. Congressional Research Service, Medicaid's Institution for Mental Diseases (IMD) Exclusion (IF10222), 2024. https://www.congress.gov/crs-product/IF10222
23. Centers for Medicare & Medicaid Services, Emergency Medical Treatment & Labor Act (EMTALA), 2026. https://www.cms.gov/medicare/regulations-guidance/legislation/emergency-medical-treatment-labor-act
24. ProPublica, For-Profit Corporations Are Buying Up More Psychiatric Hospitals. Some Flout Federal Law With Scarce Repercussions, 2024. https://www.propublica.org/article/psychiatric-hospitals-emtala-mental-health-profit
25. U.S. Department of Labor, Employee Benefits Security Administration, Mental Health Parity and Addiction Equity Act (MHPAEA), 2025. https://www.dol.gov/agencies/ebsa/laws-and-regulations/laws/mental-health-parity
26. U.S. Federal Register, 2024 Mental Health Parity and Addiction Equity Act Final Rule — Non-Enforcement Notice, 2025. https://www.federalregister.gov/documents/full_text/html/2025/06/25/2025-11606.html
27. U.S. Department of Health and Human Services, Office for Civil Rights, Civil Enforcement Program for Confidentiality of Substance Use Disorder Patient Records (42 CFR Part 2), 2026. https://www.hhs.gov/press-room/hhs-announce-civil-enforcement-program-sud-patient-records.html
28. Substance Abuse and Mental Health Services Administration, 42 CFR Part 8 Final Rule (opioid treatment programs; MOUD), 2026. https://www.samhsa.gov/substance-use/treatment/opioid-treatment-program/42-cfr-part-8
29. National Conference of State Legislatures, Certificate of Need State Laws, 2025. https://www.ncsl.org/health/certificate-of-need-state-laws
30. Behavioral Health Business, Acadia to Pay $19.85M to Settle Whistleblower Allegations Relating to Medically Unnecessary Inpatient Behavioral Health Services, 2024. https://bhbusiness.com/2024/09/26/acadia-to-pay-19-85m-to-settle-whistleblower-allegations-relating-to-medically-unnecessary-inpatient-behavioral-health-services/
31. Behavioral Health Business, Private Equity Owns 6.2% of Mental Health, 7.1% of Addiction Treatment Facilities, 2024. https://bhbusiness.com/2024/05/01/private-equity-owns-6-2-of-mental-health-7-1-of-addiction-treatment-facilities/
32. Capstone Partners, Behavioral Healthcare Services Market Update (private-equity deployment and M&A trends), 2025. https://www.capstonepartners.com/insights/article-behavioral-healthcare-services-market-update/
33. Fierce Healthcare, Universal Health Services Projects More Revenue, Earnings Gains in 2026 After 2025 Volume Shortfall, 2026. https://www.fiercehealthcare.com/providers/universal-health-services-projects-more-revenue-earnings-gains-2026
34. IBISWorld, Psychiatric & Substance Abuse Hospitals in the US — Industry Report (NAICS 622210), 2026. https://www.ibisworld.com/united-states/industry/psychiatric-substance-abuse-hospitals/1589/