Ambulance Services (U.S.) — Industry-Level Primer

NAICS 2022 code 62191. A guide for public-market and private investors.

Read this first — this level equals its one child. NAICS industry 62191 (Ambulance Services) contains exactly one national industry beneath it, 621910 — Ambulance Services, with the same name and the same scope. The two are, for practical purposes, the same thing. This page gives the rollup figures and the shape of the investment case; for the full treatment — economics, payer mix, regulation, company-by-company universe — see the 621910 leaf primer.

1. Overview

Ambulance services move sick and injured patients — by ground or by air — while medical staff treat them along the way. It is the transport-and-treatment layer of emergency medical services (EMS): the crews behind a 911 call, plus the larger, steadier volume of scheduled "interfacility" transfers between hospitals, nursing homes, and dialysis or imaging centers.

For an investor, this is essential, recession-resistant infrastructure with steady demand but genuinely hard economics. Roughly half of transports are paid at government rates that sit below the cost of providing them, and the field is fragmented and labor-intensive [1]. The winners are operators with scale, disciplined billing, and a favorable payer mix.

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

The North American Industry Classification System (NAICS) is a nested hierarchy. Most 5-digit "industries" split into several 6-digit "national industries." 62191 does not — it holds a single child:

Because there is only one child, everything true of 621910 is true of 62191: same definition, same establishments, same revenue, same companies. The 5-digit level exists only to keep the classification tree symmetric. Treat this page as a signpost; the leaf primer for 621910 carries the detail.

For orientation, the code bundles three distinct businesses inside that one child: ground 911 (emergency) response, ground non-emergency / interfacility transport (often the higher-volume, more predictable line), and air medical (helicopter and fixed-wing — a capital-heavy business with very different economics). Care in the vehicle is delivered by an Emergency Medical Technician (EMT) or paramedic at a billed level of service — Basic Life Support (BLS), Advanced Life Support (ALS), or Specialty Care Transport (SCT). See 621910 for scope boundaries (e.g., non-medical wheelchair vans fall under a different code).

3. Size

Our ground-truth federal figures for this level (NAICS 62191, private employer businesses) — identical to child 621910, since the level equals its one child:

That works out to average pay of roughly $52,000 per worker [3] and average receipts of about $6.8 million per firm [2] — small-business economics with one very large exception at the top.

Undercount caveat (large here — read it). The $20.3 billion counts only private employer businesses [2]. County Business Patterns focuses on establishments with paid employees, and the Economic Census generally excludes government-owned establishments [2][3]. That leaves out the biggest slice of U.S. ambulance activity: government-run, fire-department-based, and volunteer nonprofit EMS [1], funded by taxes and municipal budgets rather than the "receipts" the Census measures, with crews counted as government (not 62191) employees. A widely cited EMS survey put agency ownership at roughly 41% fire-based, 25% private companies, 21% non-fire government, and 6% hospital-based [1] — so the plurality of 911 response never appears in this line. Treat $20.3 billion as the private, for-profit footprint, not the whole system.

Concentration. Among private firms the market is fragmented but has a visible top end: the top four firms take 35.4% of revenue, the top eight 41.1%, the top 20 48.2%, and the top 50 58.3% [2]. (The Herfindahl-Hirschman Index, a standard concentration measure, is suppressed in the federal data, so we do not state one [2].) A single national operator sits atop a very long tail of local and regional providers.

4. Investable universe — where value concentrates

With only one child industry, all of the investment value sits in 621910; there is no cross-child allocation question at this level. In brief:

• Public markets were essentially closed to this industry until May 2026, when Global Medical Response (NYSE: GMRS) — the largest U.S. EMS provider and parent of American Medical Response (AMR) — listed on the New York Stock Exchange, creating the first near-pure-play public option [4]. Adjacent public exposure comes from DocGo (Nasdaq: DCGO), a technology-enabled mobile-health firm whose Ambulnz arm is one line among many, and ModivCare (Nasdaq: MODV), which coordinates non-emergency medical transportation (NEMT) rather than operating ambulances.
• Private and other owners dominate: air-medical leader Air Methods (now lender-owned after a 2023 restructuring), regional operators like Acadian Ambulance (100% employee-owned via an Employee Stock Ownership Plan, or ESOP), Denmark's Falck, private-equity roll-ups such as Priority Ambulance, and — the largest single share of 911 response — municipal, fire-based, and volunteer EMS, which is public/nonprofit and not investable.

The full company table, scale figures, and tickers are in the 621910 primer.

5. How the money works

Owners earn the spread between what they collect per transport and the cost of standing ready to respond 24/7. Both halves are unusual:

• It's a cost-of-readiness business. The dominant expense is keeping crews and vehicles staffed whether or not calls come in. The key operating metric is unit-hour utilization (UHU) — transports produced per staffed ambulance-hour; higher UHU spreads fixed labor across more billable trips.
• Revenue = transports × net collections per transport. Providers bill a base rate that steps up by level of service (BLS/ALS/SCT), plus mileage — but only for "loaded" miles with the patient aboard [1].
• Payer mix is destiny. Government payers (Medicare and Medicaid) are the volume majority and reimburse below cost; commercial insurance and self-pay collections cross-subsidize them. Industry-commissioned studies estimate an average per-transport shortfall on the order of $1,500 across all payers [1].
• Subsidies and contracts fill the gap. Municipal subsidies, exclusive 911 contracts, hospital/facility contracts, and Medicaid supplemental payments make the model work.
• Air medical is a different animal — very high fixed cost at low utilization, historically monetized through large out-of-network charges now squeezed by regulation [1].

Full mechanics, payer-split ranges, and the operating metrics that matter in diligence are in the 621910 primer.

6. Demand drivers

• Aging demographics are the structural tailwind — the U.S. 65-and-older population reached 61.2 million (18.0%) in 2024 [5], driving both 911 calls and the steadier, more profitable interfacility and dialysis transports.
• Baseline 911 volume and acuity — accidents, cardiac events, strokes, overdoses — is large and economically insensitive, which is what makes the top line defensive [1].
• Interfacility transfer growth as hospital networks centralize specialty care.
• Hospital and facility outsourcing of transport to private operators.
• New care models (mobile integrated healthcare, community paramedicine) are an emerging, largely non-fee-schedule line whose upside depends on payers agreeing to reimburse "treatment without transport."

Demand is defensive; demand stability does not guarantee margin stability. See 621910 for the full driver set.

7. Regulation

Economics here are set more by regulators and legislators than by markets:

• Medicare Ambulance Fee Schedule (CMS) is the reference point every payer negotiates around, including temporary rural/urban add-ons that Congress must periodically renew (current extension runs through Dec. 31, 2027) [1].
• Medicaid has no national ambulance fee schedule — states set their own methods, generally below Medicare [1].
• The No Surprises Act bans balance billing for air ambulances but explicitly excludes ground ambulances, making ground transport a common source of surprise bills; a federal advisory committee (GAPB) delivered a proposed fix to Congress on Aug. 28, 2024 [1].
• State licensing and exclusive service areas control who may run 911 in a given jurisdiction.

Full regulatory detail — add-on percentages, the Ground Ambulance Data Collection System (GADCS) reporting penalty, and the surprise-billing fight — is in the 621910 primer.

8. Consolidation

Fragmented, with a consolidating top: the top four firms hold ~35% of private revenue and the top 50 hold ~58% [2], leaving a long tail — the roll-up thesis. Competition is for contracts (municipal 911 franchises, hospital/nursing-home transport), not walk-in customers. Private equity has been the consolidator for a decade — GMR itself is a KKR creation, built from Air Medical Group Holdings and AMR [1]. Air medical consolidated separately and painfully, culminating in Air Methods' 2023 bankruptcy [1]. Tax-funded fire and municipal EMS limit any one firm's national reach.

9. Risks

• Reimbursement below cost from the government-payer majority [1].
• Policy cliffs — Medicare add-ons need re-legislating (next cliff Jan. 1, 2028), and Medicaid/supplemental funding is a perennial cut target [1].
• Surprise-billing legislation that would cap the out-of-network commercial charges currently cross-subsidizing the business [1].
• Leverage — private-equity ownership left several large operators heavily indebted; GMR needed a ~$5.4B refinancing and both Air Methods and PHI restructured through bankruptcy [1].
• Labor — chronic EMT/paramedic shortages, ~20–30% turnover, and wage inflation on the largest cost line [1].
• Contract concentration — losing a major 911 or hospital contract can strand fixed cost overnight.

Full risk register is in the 621910 primer.

10. How to invest, and the outlook

Because this level equals its one child, the investment routes are exactly those of 621910:

• Public — Global Medical Response (NYSE: GMRS) is the only large, near-pure-play bet, but understand what it is: the market leader, yet a KKR-controlled, still-leveraged, thin-margin operator whose 2026 IPO priced at a steep discount and fell on debut [4]. DocGo (Nasdaq: DCGO) offers indirect, diversified exposure; ModivCare (Nasdaq: MODV) is adjacent (NEMT coordination), not ambulance operations. There is no dedicated ambulance ETF.
• Private — this remains primarily a private-market industry [1]: private-equity healthcare-services funds, direct ownership or roll-up of regional operators, private credit, and capital to municipal EMS contractors. Diligence centers on contract duration and exclusivity, transport volume and service-level mix, payer mix and net collections, staffing and turnover, unit-hour utilization, fleet capital, and debt structure.

Editor's judgment. Demand is secularly supported by aging demographics and rising interfacility volume, but returns are made or lost on policy and payer mix, not on volume — a defensive top line wrapped around a difficult margin and balance-sheet problem. The central question is not how many calls an operator receives; it is whether it can convert required readiness into durable, collectible cash flow. For the complete analysis, read the 621910 primer.

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Sources

1. Histometrics primer for NAICS 621910 — Ambulance Services (this level's sole child), which carries the full sourcing: MedPAC and CMS on the Ambulance Fee Schedule and add-ons; the GAPB report to Congress (Aug. 28, 2024); the No Surprises Act ground-ambulance exclusion; EMS payer-mix and reimbursement-gap data; BLS and EMS-workforce reports on labor; Reuters/GMR/KKR on the 2026 IPO; and the ownership-mix survey. See that primer's numbered Sources list for the underlying references.
2. U.S. Census Bureau, Economic Census — Concentration & Receipts, NAICS 621910 (2022) — receipts, firm count, CR4/CR8/CR20/CR50 ratios (HHI suppressed). https://www.census.gov/programs-surveys/economic-census.html
3. U.S. Census Bureau, County Business Patterns (CBP), NAICS 621910 (2023) — establishments, employment, annual and first-quarter payroll. https://www.census.gov/programs-surveys/cbp.html
4. Reuters / U.S. News, "KKR-Backed Ambulance Giant GMR Valued at $3 Billion as Shares Fall in NYSE Debut" (2026) — NYSE: GMRS IPO pricing and debut. https://money.usnews.com/investing/news/articles/2026-05-13/kkr-backed-ambulance-giant-gmr-shares-fall-10-in-nyse-debut
5. U.S. Census Bureau, "Older Adults Outnumber Children..." (2025) — 65+ population 61.2M / 18.0% (2024). https://www.census.gov/newsroom/press-releases/2025/older-adults-outnumber-children.html