Offices of All Other Miscellaneous Health Practitioners (U.S.) — NAICS 621399

1. Overview

This is the "everything else" bucket of the U.S. outpatient health economy: independent practitioners who are licensed to deliver care but who are not physicians, dentists, chiropractors, optometrists, mental-health specialists, physical/occupational/speech therapists, audiologists, or podiatrists. In practice it is the world of acupuncturists, dietitians and nutritionists, midwives, naturopaths, homeopaths, hypnotherapists, clinical (therapeutic) massage therapists, denturists, dental hygienists, and — increasingly important — independent nurse practitioners (NPs), physician assistants (PAs), and registered nurses (RNs) who open their own practice. NAICS is the North American Industry Classification System, the standard federal scheme for grouping businesses by activity [1].

Why it matters to an investor: this is a large, growing, and extraordinarily fragmented slice of health care. Federal data count roughly 36,000 employer offices, 136,000 employees, and about $18 billion in annual receipts — and those numbers understate the true footprint, because most operators are solo, self-employed practitioners with no payroll (Section 3) [2][3]. The industry sits at the crossroads of two powerful tailwinds: the consumer wellness boom (cash-pay acupuncture, nutrition, holistic care) and the expansion of who is legally allowed to deliver mainstream medical care (NP/PA independent practice).

Public vs. private ways in: there is essentially no pure public-market play. It is a cottage industry of small businesses, so stock-market investors get only indirect exposure — through telehealth platforms that employ NPs and PAs, practice-enablement software, wellness franchisors, and the broader supply chain. The real ownership opportunity is private: owning, building, franchising, or rolling up practices (Sections 4 and 10). The core operating question either way is the same: can an owner recruit clinicians, fill appointment capacity, collect payment, and standardize the back office without eroding clinical trust?

2. What it is, and how it's structured

Scope. NAICS code 621399 covers establishments of independent health practitioners not classified anywhere else in the "Offices of Other Health Practitioners" family — operating alone or in groups, in their own offices or inside facilities owned by hospitals, health maintenance organizations (HMOs), or other providers. Census illustrative examples include offices of acupuncturists (non-physician), dietitians and nutritionists, midwives, naturopaths, homeopaths, hypnotherapists, denturists, dental hygienists, inhalation/respiratory therapists, orthotics/prosthetics and manual-arts practitioners, and registered and licensed practical nurses (RNs/LPNs), nurse practitioners, and physician assistants [1]. Clinically oriented therapeutic massage offices are also classified here [6].

What it explicitly excludes — these adjacent activities sit in their own NAICS codes and are not part of 621399 [1]:

• Physicians → 621111 / 621112
• Dentists → 621210
• Chiropractors → 621310
• Optometrists → 621320
• Mental-health practitioners (non-physician) → 621330
• Physical, occupational, speech therapists and audiologists → 621340
• Podiatrists → 621391
• Outpatient care centers → 6214; Medical and diagnostic laboratories → 62151; Home health care → 621610; Ambulance services → 621910; Other ambulatory health care → 621999
• Relaxation/wellness (non-therapeutic) massage, spas, skincare → 812199 (Other Personal Care Services). The therapeutic-vs-relaxation line is the specific fork that splits massage between 621399 and 812199 [6].

Ownership mix. Overwhelmingly owner-operated small businesses: sole practitioners and small partnerships, often organized as professional corporations or LLCs, a minority as group clinics or embedded in hospital integrative-medicine departments. Corporate ownership is thin and mostly recent, arriving through franchises, multi-unit operators, private equity (PE), and management services organizations (MSOs) rather than any large operating chain (Section 8). The federal data supplied for this primer do not report an ownership split, so no percentage is estimated. The classification is slippery for mixed businesses — a therapeutic massage office fits 621399, while a wellness spa or skincare center falls under 812199, and a virtual dietitian platform may serve the same need while classified outside the office-based code.

3. How big it is

Federal figures (our ground-truth statistics). Note these blend two datasets and reference years: employer establishments, employment, and payroll from County Business Patterns (CBP) 2023, and firms, receipts, and concentration from the 2022 Economic Census.

That works out to about $57,000 in payroll per employee, roughly $616,000 in annual receipts per employer firm, and fewer than four employees per office on average — the profile of a labor-intensive local service business, not a capital-heavy one [2][3].

The undercount caveat (important). These are employer statistics: they count only businesses with paid employees, and CBP also excludes most government employees [7]. This industry is dominated by solo, self-employed practitioners — an acupuncturist, a dietitian, a midwife working alone — who file as nonemployer businesses and are excluded from CBP and from the Economic Census employer counts [5]. Census "Nonemployer Statistics" cover exactly these one-person operations, and across health-practitioner categories nonemployers vastly outnumber employer establishments; our supplied file does not include a 621399 nonemployer total, so we do not state one. The takeaway: the true count of practices is materially larger than 36,000, and the true economic footprint larger than $18 billion. Treat the $18 billion as a floor for the employer segment, not the size of the whole activity. No industry-wide margin, visit-volume, payer-mix, or same-location-sales figures were supplied, so none are asserted here.

4. The investable universe

Public companies: no pure-play exists. The industry is too fragmented and too small-business for a listed operator to represent it. Public markets offer only proxy exposure — companies whose economics overlap with independent NP/PA/nutrition/wellness practice, not the industry itself. Read these as adjacent bets, and note that their fortunes hinge on telehealth regulation and GLP-1 (glucagon-like peptide-1) weight-loss drugs far more than on the classic acupuncture/nutrition/midwifery trade.

Other picks-and-shovels proxies sell into or around these offices rather than operating them: patient-intake and payments software (Phreesia, PHR) and fertility/benefits managers whose networks touch nurse-midwives (Progyny, PGNY).

Private and other owners — where the industry actually lives:

• Tens of thousands of independent sole practitioners and small group clinics (the core).
• Hospital and health-system integrative-medicine departments that employ acupuncturists, dietitians, and midwives.
• PE- and physician-backed MSOs and wellness/med-spa platforms consolidating small clinics (Section 8) [19].
• Roark Capital / Massage Envy — Roark lists Massage Envy in its portfolio; the national franchisor's local units are independently owned, and only the therapeutic-massage portion maps to 621399 (skincare/spa falls elsewhere) [27][28].
• Modern Acupuncture (ACU Development) — a private acupuncture franchisor built on memberships, recurring billing, and a mostly cash-pay model; structure varies by state [29].
• Nourish — a private, virtual dietitian platform reporting a network of 10,000+ registered dietitians (Series C of $100M); its virtual model is not necessarily office-based 621399 [30].
• American Specialty Health — a private specialty-health network/administrator connecting health plans with acupuncture, naturopathy, and nutrition providers; an infrastructure business, not a clinic owner [31].
• Hand & Stone — a private membership-based massage/facial franchise with 600+ locations reported; only the therapeutic-practitioner portion is relevant to 621399 [32].

5. How the money works

These are professional-services businesses, so the economics are driven by practitioner time, not inventory or equipment.

• Revenue = practitioners × billable visits × fee per visit. The core lever is utilization — how full each practitioner's schedule is. The main input is skilled human hours, so a half-empty schedule is the profit killer and an empty appointment slot cannot be inventoried and sold later. Revenue models vary sharply by subsector: insurance fee-for-service (dietitians, nurses, clinically reimbursable care); direct/cash-pay appointments (acupuncture, massage, naturopathy); memberships/subscriptions (franchise and wellness models); employer, health-plan, or health-system contracts; and franchise royalties or MSO fees layered on top.
• Payer mix is the other big lever, and it's split.
• Cash-pay / out-of-pocket: Much of the "wellness" side — acupuncture beyond narrow coverage, naturopathy, homeopathy, most nutrition counseling, hypnotherapy — is paid directly by consumers. High-margin but discretionary and cycle-sensitive.
• Insurance-reimbursed: The clinical side bills payers. NPs and PAs billing Medicare are generally paid at 85% of the physician fee schedule for the same service; billed "incident to" a supervising physician, the identical service can be paid at 100% [12]. Medicare covers acupuncture only for chronic low back pain (up to 12 visits in 90 days, up to 20 a year, credentialed providers only) [11], and registered dietitians can bill medical nutrition therapy (MNT) for diabetes and kidney disease [10]; midwifery is widely covered by Medicaid. Reimbursement rates and coverage decisions set the ceiling on the clinical book.
• Cost structure. The main cost is clinician labor. Then rent, front-desk and billing staff, malpractice/liability insurance, credentialing, software, marketing, and supplies — plus the administrative drag of claims for insurance-billing practices. Capital intensity is low (rooms, tables, basic equipment), which keeps barriers to entry low.
• The metrics that matter. Revenue per clinician and per available clinical hour; appointment utilization, cancellations, and no-shows; repeat-visit rate and membership churn; payer mix, reimbursement per visit, denial rate, and accounts-receivable days; clinician turnover and vacancy time; same-location revenue for multi-unit operators; marketing cost per new patient; and rent as a share of location revenue.
• Owner economics. For a solo practitioner, "profit" is largely the value of their own labor after overhead. Margin expands by raising utilization, shifting toward cash-pay services, and adding mid-level staff whose billings exceed their cost. Scaling means adding chairs, rooms, and clinicians — a linear, people-limited grind, not a software-style step-up.

Forward-looking judgment: the most attractive units combine a defensible cash-pay wellness base (pricing power, no payer haircut) with a reimbursed clinical anchor (volume and referral flow). Pure cash-pay is higher-margin but more fragile in a downturn; pure reimbursed is steadier but exposed to fee-schedule cuts.

6. What drives demand

• Aging population. The U.S. population age 65 and older reached 61.2 million in 2024 — 18.0% of the population, up 3.1% from 2023 [8]. That supports demand for nutrition therapy, respiratory and pain care, mobility support, and nurse-led chronic-care management.
• Chronic disease. In 2023, 76.4% of U.S. adults — roughly 194 million people — reported at least one chronic condition [9]. That expands the potential role of dietitians, nurses, acupuncturists, and other non-physician practitioners, though reimbursement remains uneven.
• The obesity/GLP-1 wave. The surge in GLP-1 weight-loss treatment drives demand for nutrition counseling, often bundled with medication management delivered by NPs and PAs [21].
• Scope-of-practice expansion. Roughly 30 states plus Washington, D.C., now grant NPs full practice authority — the legal right to evaluate, diagnose, and prescribe without physician oversight — up from about 22 states in 2020 [13]. Every expansion converts NPs from employees into potential independent practice owners, directly enlarging this NAICS category.
• Primary-care shortages. Physician shortages push patients toward NP- and PA-led practices, especially in rural and underserved areas.
• Coverage expansion / integrative medicine going mainstream. Medicare covers MNT for beneficiaries with diabetes or kidney disease (three hours in the first year, two hours in later years, with referral) [10], and acupuncture for chronic low back pain under defined limits since 2020 [11]. Hospitals increasingly fold acupuncture, nutrition, and midwifery into pain, oncology, and maternity programs.
• Access, convenience, and the wellness boom. Patients value evening hours, retail locations, online scheduling, home visits, and virtual care — features that favor franchising and centralized technology. Third-party researchers size the broad U.S. complementary-and-alternative-medicine (CAM) market in the tens of billions and growing at double digits, with alternative-healthcare providers a multibillion-dollar slice [17][18]. Membership-based massage, acupuncture, and nutrition models create recurring revenue, but they are more exposed to household budgets than medically necessary care.

7. Regulation

Regulation here is unusually fragmented because it runs profession-by-profession and state-by-state.

• State licensing and scope of practice. Each profession (acupuncture, dietetics, midwifery, naturopathy, nursing) is licensed at the state level, and the scope of what a licensee may legally do varies enormously. Naturopaths are licensed in some states and unregulated in others; midwifery rules differ for certified nurse-midwives versus certified professional midwives; "nutritionist" title protection is contested state by state; supervision and referral rules differ throughout.
• NP/PA practice authority. The single biggest regulatory swing factor. Full-practice-authority laws (now ~30 states + D.C.) determine whether NPs can own and operate independent offices at all [13].
• Medicare/Medicaid coverage and payment. The 85% NP/PA payment rate and "incident-to" rules [12], the narrow acupuncture coverage determination [11], dietitian MNT coverage [10], and Medicaid midwifery coverage collectively set what the reimbursed side can earn; annual changes to the Medicare Physician Fee Schedule move revenue directly.
• Corporate-practice-of-medicine doctrine. Many states restrict non-clinician ownership or control of clinical practices [16]. This is why PE consolidation runs through MSO structures — the investor owns the management company; licensed clinicians own the practice — rather than direct ownership (Section 8).
• Privacy and billing rules. Clinics handling electronic protected health information (PHI) are subject to the HIPAA (Health Insurance Portability and Accountability Act) Security Rule, requiring administrative, physical, and technical safeguards [14]. Under the No Surprises Act (effective January 1, 2022), uninsured or self-pay patients generally must receive a good-faith estimate before care [15].
• Telehealth and compounding rules. The platform-based operators (Section 4) live and die by cross-state telehealth licensure, controlled-substance prescribing rules, and U.S. Food and Drug Administration (FDA) policy on compounded GLP-1 drugs — an active area of regulatory tightening [21].

Investors should treat licensure and ownership structure as transaction-level diligence items, not boilerplate legal review.

8. Competitive dynamics and consolidation

This is one of the most fragmented industries in the entire economy. Federal concentration data tell the story: the largest 4 firms hold just 15.8% of receipts (the CR4, or four-firm concentration ratio), the top 8 hold 17.6%, the top 20 hold 20.2%, and even the top 50 hold only 24.3% — with a Herfindahl-Hirschman Index (HHI, a standard concentration score where anything under 1,500 is "unconcentrated") of about 85 [3]. An HHI that low is close to a textbook atomistic market: thousands of independent operators, no dominant player, and competition that is intensely local.

Consolidation is early and structural, not scale-driven:

• Telehealth platforms (Hims & Hers, LifeMD) aggregate NP/PA labor under a national consumer brand — the closest thing to a "chain," but built on virtual care and pharmacy economics rather than physical offices [20][22].
• PE and MSO roll-ups of wellness, med-spa, and multi-specialty clinics buy up small practices, using management-company structures to work around corporate-practice-of-medicine rules [19].
• Franchising suits standardized, cash-pay services (massage, acupuncture) better than individualized or heavily regulated care [27][29][32].
• Hospital employment pulls acupuncturists, dietitians, and midwives into integrated programs.

Where scale can help: centralized scheduling, billing, credentialing, and compliance; better clinician recruiting; health-plan contracting; brand marketing and digital acquisition; shared purchasing and technology; and membership programs that lift retention. But because barriers to entry are low and moats are local (reputation, referral relationships, location), roll-ups struggle to build durable pricing power — national fragmentation does not guarantee attractive roll-up returns, and local shortages, inconsistent records, state ownership rules, and weak integration can erase expected synergies. The value creation comes mostly from professionalizing billing, marketing, and back office, not from market dominance.

9. Risks

• Reimbursement risk. Medicare Physician Fee Schedule cuts, changes to the 85% NP/PA rate or "incident-to" rules, and narrow or withdrawn coverage decisions directly compress the reimbursed book [11][12].
• Regulatory reversal or fragmentation. Scope-of-practice is politically contested; physician-group opposition can slow or roll back NP independence, and state-by-state variation raises compliance cost for any multi-state operator [13].
• Regulatory ownership risk. State corporate-practice rules may limit PE ownership, MSO control, fee arrangements, or professional-entity structures [16].
• Telehealth and GLP-1 policy. The public proxies are heavily exposed to compounded-GLP-1 crackdowns, telehealth-prescribing rules, and shifts in branded-drug supply and pricing — regulatory, not operational, risk [21].
• Discretionary-demand cyclicality. The cash-pay wellness base is out-of-pocket and gets cut when household budgets tighten.
• Labor. The product is skilled labor; practitioner shortages, wage inflation, vacancy time, and burnout cap capacity and margins.
• Low barriers, weak moats, local competition. Easy entry means persistent competition; low national concentration can conceal a strong local competitor or a dominant health-plan network.
• Quality, liability, and classification risk. A single clinical incident, licensing violation, fraud allegation, or weak franchisee can damage a local or national brand — and because this is a residual code, a company's actual locations may span several NAICS categories.
• Roll-up and data risk. Acquirers can overpay for owner-dependent practices whose patient relationships do not transfer; the heavy nonemployer tail (Section 3) means public statistics are an incomplete map, so market diligence has to be built bottom-up.
• Cybersecurity. Small practices often have limited security budgets but handle sensitive health data [14].

10. How to invest, and the outlook

Public routes (indirect only). There is no listed company that is this industry. Stock-market investors seeking exposure buy adjacencies: telehealth platforms that monetize NP/PA labor and nutrition/weight-management demand (HIMS, LFMD, TDOC), primary-care adjacency (AMZN via One Medical), or wellness-franchise and software analogs (XPOF, JYNT, PHR, PGNY). Judge these on telehealth and GLP-1 dynamics, subscriber growth, and regulatory exposure — their valuations and subscriber economics reflect consumer-health tech, not the underlying acupuncture/nutrition/midwifery trade. The cleanest listed exposure tends to come from infrastructure (billing, scheduling, provider networks, digital care) rather than clinic ownership. Anyone buying these "for exposure to independent practitioners" is really buying a consumer-telehealth thesis.

Private routes (the real industry).

• Own or build a practice: the classic route — a licensed practitioner (or a partner backing one) builds a book, ideally blending high-margin cash-pay wellness with a reimbursed clinical anchor.
• Roll-up / MSO: acquire and professionalize small clinics under a management company, respecting corporate-practice-of-medicine rules; value comes from back-office scale, not market power [19].
• Franchise / multi-unit: mainly in the therapeutic-massage and cash-pay wellness lanes [27][29][32].
• Venture / growth equity: into private nutrition marketplaces and NP-led virtual-care startups [30].

Underwrite the local unit economics first: confirm the exact service mix, clinician ownership, licenses, payer contracts, patient retention, lease obligations, and cash conversion.

Near-term drivers to watch (forward-looking).

1. NP full-practice-authority legislation — each new state expands the pool of independent owners [13].
2. The GLP-1 cycle and its regulation — a demand engine for nutrition and NP-led weight management, but a policy risk for the telehealth proxies [21].
3. Medicare/Medicaid coverage and fee-schedule decisions on acupuncture, nutrition therapy, midwifery, and NP/PA payment [10][11][12].
4. Consumer wellness spending, which sets the ceiling on the cash-pay base [17][18].

Bottom line: a large, structurally growing, deeply fragmented small-business industry riding real demographic and regulatory tailwinds — but one where public investors can only rent exposure through proxies, and where the genuine ownership returns are earned privately, one practice (or one carefully underwritten roll-up) at a time. The binding constraint is not national demand; it is converting a fragmented, regulated, labor-dependent service base into consistently profitable local units.

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Sources

1. U.S. Census Bureau. "2022 NAICS Definition — 621399 Offices of All Other Miscellaneous Health Practitioners" (definition and cross-references). https://www.census.gov/naics/?input=621399&year=2022
2. U.S. Census Bureau. "County Business Patterns, 2023 — NAICS 621399" (establishments, employment, annual and first-quarter payroll). https://data.census.gov/table/CBP2023.CB2300CBP?n=621399
3. U.S. Census Bureau. "2022 Economic Census — Concentration of Largest Firms for the U.S., NAICS 621399" (firms, receipts, CR4/CR8/CR20/CR50, HHI). https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN?n=621399
4. U.S. Small Business Administration. "Table of Small Business Size Standards" (NAICS 621399 = $10 million average annual receipts). 2023. https://www.sba.gov/document/support-table-size-standards
5. U.S. Census Bureau. "Nonemployer Statistics — Program Overview" (self-employed/sole-proprietor businesses excluded from employer statistics). https://www.census.gov/econ/overview/mu0500.html
6. American Massage Therapy Association. "NAICS Update" (therapeutic massage classified in 621399; wellness/relaxation massage in 812199). https://www.amtamassage.org/about/news/naics-update/
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8. U.S. Census Bureau. "Older Adults Outnumber Children in 11 States and Nearly Half of U.S. Counties" (65+ population 61.2 million, 18.0%, +3.1% from 2023). 2025. https://www.census.gov/newsroom/press-releases/2025/older-adults-outnumber-children.html
9. Centers for Disease Control and Prevention. "Trends in Multiple Chronic Conditions Among U.S. Adults, 2013–2023" (76.4% of adults, ~194 million, with ≥1 chronic condition in 2023). 2025. https://www.cdc.gov/pcd/issues/2025/24_0539.htm
10. Medicare.gov. "Medical Nutrition Therapy Services" (coverage for diabetes/kidney disease; 3 hours first year, 2 hours later years). https://www.medicare.gov/coverage/medical-nutrition-therapy-services
11. Centers for Medicare & Medicaid Services. "National Coverage Determination 30.3.3 — Acupuncture for Chronic Low Back Pain" (up to 12 visits/90 days, up to 20/year). 2020. https://www.cms.gov/medicare-coverage-database/view/ncd.aspx?NCDId=373
12. Centers for Medicare & Medicaid Services. "Advanced Practice Registered Nurses, Physician Assistants — Payment at 85% of the Physician Fee Schedule; incident-to billing." https://www.cms.gov/medicare/payment/fee-schedules/physician-fee-schedule/advanced-practice-non-physician-practitioners/advanced-practice-registered-nurses-aprns
13. American Association of Nurse Practitioners. "State Practice Environment — Full Practice Authority" (~30 states + D.C., up from ~22 in 2020). https://www.aanp.org/advocacy/state/state-practice-environment
14. U.S. Department of Health and Human Services. "The HIPAA Security Rule." https://www.hhs.gov/hipaa/for-professionals/security/index.html
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19. Private Equity Stakeholder Project. "Private Equity Health Care Acquisitions" (outpatient practice roll-ups via MSO structures). https://pestakeholder.org/news/
20. U.S. Securities and Exchange Commission. "Hims & Hers Health, Inc. 2025 Form 10-K" (revenue, subscribers). https://www.sec.gov/Archives/edgar/data/1773751/000177375126000022/hims-20251231.htm
21. Fierce Healthcare. "Hims & Hers projects weight-loss business despite GLP-1 market shift." 2025. https://www.fiercehealthcare.com/health-tech/hims-hers-bullish-weight-loss-business-despite-glp-1-market-shift
22. U.S. Securities and Exchange Commission. "LifeMD, Inc. Q4 2024 Results / Form 8-K" (weight-management subscribers; telehealth brands). 2025. https://www.sec.gov/Archives/edgar/data/948320/000149315225009690/ex99-1.htm
23. U.S. Securities and Exchange Commission. "Teladoc Health, Inc. 2025 Form 10-K." https://www.sec.gov/Archives/edgar/data/1477449/000147744926000012/tdoc-20251231.htm
24. U.S. Securities and Exchange Commission. "Amazon.com, Inc. 2025 Form 10-K" (One Medical). https://www.sec.gov/Archives/edgar/data/1018724/000101872426000004/amzn-20251231.htm
25. U.S. Securities and Exchange Commission. "Xponential Fitness, Inc. 2025 Form 10-K." https://www.sec.gov/Archives/edgar/data/1802156/000180215626000016/xpof-20251231.htm
26. U.S. Securities and Exchange Commission. "The Joint Corp. 2025 Form 10-K." https://www.sec.gov/Archives/edgar/data/1612630/000161263026000022/jynt-20251231.htm
27. Roark Capital. "Current Investments / Portfolio" (Massage Envy). https://www.roarkcapital.com/portfolio
28. Massage Envy. "About Us — Newsroom / Franchise" (national franchisor; franchisee-owned locations). https://www.massageenvy.com/about-us/
29. Modern Acupuncture. "Franchise Opportunities" (membership, recurring-billing, cash-pay acupuncture franchisor). https://www.modernacupuncturefranchise.com/
30. Nourish. "Nourish Raises $100M Series C" (virtual dietitian platform; 10,000+ registered dietitians). https://www.nourish.com/blog/nourish-announces-series-c
31. American Specialty Health. "Specialty Health Services / Provider Networks" (acupuncture, naturopathy, nutrition network administrator). https://www.ashcompanies.com/
32. Hand & Stone. "Franchise Opportunities" (membership-based massage/facial franchise, 600+ locations). https://handandstone.com/franchise/