Specialty (except Psychiatric and Substance Abuse) Hospitals — U.S. Industry Primer

NAICS 2022 code 62231. A Histometrics industry primer for public-market and private investors. NAICS is the North American Industry Classification System, the U.S. government's standard for grouping businesses.

Read this first — this level equals its one child. NAICS industry 62231 contains exactly one national industry, 622310 (Specialty (except Psychiatric and Substance Abuse) Hospitals). At the five-digit level the two codes describe the same set of businesses, so this page is a short rollup: it gives 62231's own federal statistics and a compact map of the industry, then points you to the full 622310 primer for detail on operators, economics, regulation, and how to invest. Where you see a claim here without a fresh figure of its own, the underlying evidence and citations live in the 622310 primer.

1. Overview

This industry is the set of freestanding U.S. hospitals that focus on one type of patient or condition rather than offering full general acute care: inpatient rehabilitation hospitals (recovery from stroke, brain and spinal injury, joint replacement), long-term acute care hospitals (weeks of intensive care such as ventilator weaning), and freestanding children's and cancer hospitals.[1]

It is a healthcare-delivery industry, not simply a stock-market sector. Owners mostly do not set their own prices — Medicare (federal insurance for people 65+ and some disabled) and Medicaid (federal-state insurance for low-income patients) do — so the economics turn on federal payment policy as much as on operations.

2. What's inside — and why the level equals its one child

NAICS nests from broad to narrow: sector (2-digit) → subsector (3) → industry group (4) → NAICS industry (5) → national industry (6). At the five-digit level, 62231 has a single six-digit child, 622310, with no siblings to aggregate. So the rollup carries no extra businesses of its own — it is a relabeling of the same industry, and every figure in Section 3 is simultaneously 62231's and 622310's.[1]

Inside that one industry sit four very different institutions under one code — inpatient rehabilitation facilities (IRFs), long-term care hospitals (LTCHs, also called long-term acute care or LTAC), children's specialty hospitals, and cancer/oncology hospitals. The code is narrower than "hospitals that aren't general": it excludes general medical and surgical hospitals (NAICS 622110), psychiatric and substance-abuse hospitals (622210), ambulatory surgery centers (621493), and nursing facilities (623110). It also captures only freestanding specialty hospitals — a cancer center or rehab unit run as a department of a general hospital is counted under 622110, not here.[1] The full breakdown of the four sub-segments and the ownership split (for-profit chains in rehab/LTAC; nonprofit and public institutions in children's and cancer) is in the 622310 primer.

3. Size (this level's rollup figures)

Federal business statistics for NAICS 62231 — our ground-truth figures. Because the level equals its one child, these are also the 622310 numbers.

So the measured industry is roughly 1,000 freestanding hospitals, ~296,000 workers, and ~$58 billion in annual receipts. Reported payroll (~$23.4B, 2023) is about 40% of reported receipts (~$58.4B, 2022) — add benefits and contract/agency staffing and total labor runs higher still. Labor, not pricing, is the swing cost.

Undercount and coverage caveats — read before using the headline numbers:

1. Two surveys, two years. Establishments, employment, and payroll are CBP 2023; receipts and firms are the 2022 Economic Census. Don't blend them into a single same-year snapshot.[2][3]
2. Government hospitals are handled differently. Hospitals are an explicit exception to CBP's usual exclusion of government establishments, so public hospitals are in the employment/establishment/payroll figures.[4] The Economic Census receipts and firm counts, however, largely exclude government-owned hospitals — so public academic cancer centers (e.g., MD Anderson) and public children's hospitals sit outside the ~$58 billion receipts even though their workers show up in CBP. The receipts figure is therefore an undercount of the industry's true output.
3. Specialty care inside general hospitals is counted elsewhere (under 622110). This code captures only freestanding, single-focus hospitals.

Treat the ~$58 billion as "receipts of freestanding, mostly for-profit specialty hospitals reporting to the Economic Census" — a sliver of the >$1 trillion U.S. hospital sector by design.

4. Investable universe (where value concentrates)

Because 62231 is 622310, the investable map is identical — and thin. There is essentially one large listed pure-play: Encompass Health (NYSE: EHC), the biggest freestanding inpatient-rehab operator (173 rehab hospitals at year-end 2025).[5] The other historical pure-play, Select Medical, was taken private on July 1, 2026 at $16.50/share (~$3.9 billion) and delisted, so it is no longer a listed option.[6][7]

Everything else is partial or indirect: diversified hospital operators HCA Healthcare (HCA) and Tenet Healthcare (THC) own some specialty/rehab facilities inside larger businesses; Apollo Global Management (APO) is a sponsor behind LifePoint and ScionHealth; and Medical Properties Trust (MPW) is a real-estate investment trust (REIT) that owns specialty-hospital buildings (a bet on the rent, with tenant-credit risk).[8] The large children's and cancer institutions are overwhelmingly nonprofit or public — reachable only through private markets or tax-exempt bonds. The full table, the common miscounts (UHS, Acadia, Surgery Partners are not clean 622310 comparables), and the private/nonprofit owner list are in the 622310 primer.

5. How the money works

Economics are case-rate and reimbursement-driven, not price-driven: owners earn the spread between what a program or insurer pays per patient and what the stay costs. Revenue is essentially discharges × payment per case, set largely by Medicare's prospective payment systems (PPS — fixed, predetermined payments per discharge) for IRFs and LTCHs. The model has real operating leverage — once a hospital is built and staffed, incremental volume drops toward the margin, but under-filled beds leave fixed costs intact. Margins diverge sharply by ownership: Medicare's advisers (MedPAC) have found for-profit freestanding rehab hospitals earning Medicare margins above 20%, while nonprofit children's and cancer hospitals run near breakeven and lean on philanthropy, NIH (National Institutes of Health) research funding, and the 340B drug-discount program.[9] The operating metrics, payer-mix mechanics, and the sale-leaseback financing model are detailed in the 622310 primer.

6. Demand drivers

Demand is largely derived — specialty hospitals sit downstream of general hospitals (Encompass reported 92% of its patients were admitted from acute-care hospitals in 2025).[5] The core structural tailwind is an aging population (more strokes, joint replacements, long ICU stays) plus higher survival after serious illness. The main headwinds are Medicare Advantage growth (private Medicare plans use prior authorization to steer toward cheaper settings and shorter stays) and site-of-care migration to home health, skilled nursing, and outpatient therapy. The children's and cancer segment is driven instead by disease prevalence, NIH funding, and philanthropy. Full treatment is in the 622310 primer.

7. Regulation

This is one of the most tightly regulated corners of health care, and the rules are the business model. Key levers: Medicare Conditions of Participation; annual IRF and LTCH payment rulemaking (CMS — the Centers for Medicare & Medicaid Services — resets rates each October 1); the IRF "60% Rule" (≥60% of patients must have a qualifying condition); LTCH "site-neutral" payment (since the 2013 Bipartisan Budget Act, which shrank the LTCH count); the ACA's (Affordable Care Act) physician-owned-hospital freeze; and state Certificate of Need (CON) programs (35 states plus Washington, D.C., as of January 2025).[10] The full regulatory map is in the 622310 primer.

8. Consolidation

National concentration looks low but is misleading, because competition is local — a metro may have only one rehab or LTAC operator. The published figures for the industry:

The national HHI (a standard concentration measure; under 1,500 is "unconcentrated") is just ~335, but that reflects a nationally fragmented count of local markets, several effectively single-operator. The 280 firms (2022, excludes government hospitals) sit well below the 995 establishments (2023, includes them) — consistent with multi-hospital chains running many sites over a long tail of single-site nonprofits.[2][3] Private equity is deeply embedded and the trend is away from public listing. See the 622310 primer for detail.

9. Risks

Reimbursement risk dominates — any CMS rate cut, tightened eligibility, or expansion of site-neutral payment hits revenue directly. Other material risks: Medicare Advantage penetration (lower rates, denials, shorter stays); regulatory compliance (IRF 60% Rule, LTCH criteria, medical-necessity audits, CON, physician-ownership rules); labor cost and shortages; referral and payer-mix concentration; leverage and lease burden (sale-leaseback rent makes operators fragile when census dips — ScionHealth's debt restructuring is a live example); and nonprofit-specific dependence on philanthropy, NIH grants, and the politically contested 340B program.[8][9] Full list in the 622310 primer.

10. How to invest, and the outlook

Public-market routes reduce, in practice, to Encompass Health (NYSE: EHC) — the one large listed pure-play (~$5.9 billion 2025 revenue, growing bed capacity, a small dividend yielding under 1%)[5][11] — plus diluted exposure through diversified operators (HCA, THC), a sponsor (APO), and a REIT (MPW). Private-market routes are the larger opportunity: direct operator equity, joint ventures with acute-care hospitals, facility real estate, private credit, turnaround acquisitions, and — for the nonprofit children's and cancer core — tax-exempt municipal / hospital-revenue bonds.[8]

Outlook (judgment, not a forecast). The demand backdrop is durable — aging demographics and higher survival should keep post-acute referral volume growing — but reimbursement is the ceiling: Medicare Advantage growth and any further site-neutral expansion pressure rates and length of stay, so margins, not volumes, are the thing to watch. Two wildcards: loosening the ACA physician-owned-hospital freeze would unlock new specialty-hospital formation, while cuts to 340B or NIH funding would pressure the nonprofit segment. On balance a demand-durable but policy-capped industry. There is no single official growth forecast for NAICS 62231/622310 in the federal data, so underwrite individual operators and facilities. For full detail on every section above, see the 622310 primer.

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Sources

1. U.S. Census Bureau, NAICS 2022 — 622310 Specialty (except Psychiatric and Substance Abuse) Hospitals (definition, exclusions, and single-child structure of 62231), 2022. https://www.census.gov/naics/?details=622310&input=622310&year=2022
2. U.S. Census Bureau, County Business Patterns (CBP), NAICS 622310 — establishments, employment, annual payroll, first-quarter payroll, 2023. https://www.census.gov/data/datasets/2023/econ/cbp/2023-cbp.html
3. U.S. Census Bureau, 2022 Economic Census — Comparative Statistics / Concentration, NAICS 622310 (receipts, firms, CR4/CR8/CR20/CR50, HHI), 2022. https://www.census.gov/data/tables/2022/econ/economic-census/naics-sector-62.html
4. U.S. Census Bureau, County Business Patterns — Methodology (hospitals as an exception to the government-establishment exclusion), 2026. https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html
5. Encompass Health Corp., 2025 Form 10-K / Fourth-Quarter 2025 Results (173 rehab hospitals; ~$5.9B revenue; 92% of patients admitted from acute-care hospitals), 2026. https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000785161&type=10-K
6. Select Medical Holdings Corp., 2025 Form 10-K / Fourth-Quarter 2025 Results (104 LTAC hospitals, 38 rehab hospitals), 2026. https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001320414&type=10-K
7. Select Medical Holdings Corp., Acquired by Consortium Led by Robert A. Ortenzio, Martin F. Jackson, and WCAS ($16.50/share; ~$3.9B; NYSE delisting effective July 1, 2026), PR Newswire, 2026. https://www.prnewswire.com/news-releases/select-medical-holdings-corporation-acquired-by-consortium-led-by-robert-a-ortenzio-martin-f-jackson-and-wcas-302814693.html
8. Private Equity Stakeholder Project, Apollo-owned ScionHealth: LTCH operations, debt distress, and sale-leasebacks, 2025. https://pestakeholder.org/news/apollo-owned-scionhealth-quietly-sells-and-leases-back-5-hospitals-from-reit/
9. MedPAC, Inpatient Rehabilitation Facilities Payment System (IRF PPS basics; margin differences by ownership, for-profit freestanding >20%), 2024–2025. https://www.medpac.gov/wp-content/uploads/2024/10/MedPAC_Payment_Basics_25_IRF_FINAL_SEC.pdf
10. National Conference of State Legislatures, Certificate of Need State Laws (35 states and Washington, D.C., as of January 2025), 2025. https://www.ncsl.org/health/certificate-of-need-state-laws
11. StockAnalysis / Companies Market Cap, Encompass Health (EHC) market cap and dividend, 2026. https://stockanalysis.com/stocks/ehc/market-cap/