Ambulance Services (U.S.) — Industry Primer

NAICS 2022 code 621910. A guide for public-market and private investors.

1. Overview

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

Why it matters to an investor: this is essential, recession-resistant infrastructure with steady demand, but a genuinely hard business to earn money in. Roughly half of the transports it performs are paid at government rates that sit below the cost of providing them [23], and the field is highly fragmented and labor-intensive [20][22]. The winners are operators with scale, disciplined billing, and a favorable payer mix.

Ways in differ sharply by investor type. For public-market investors, the field was almost entirely private until May 2026, when the sector's largest operator, Global Medical Response, listed on the New York Stock Exchange (NYSE) [8] — creating the first near-pure-play public option, alongside a diversified mobile-health name and an adjacent transportation company. For private investors, this has for a decade been a private-equity (PE) roll-up story: buy fragmented local operators, consolidate billing and dispatch, and win exclusive municipal 911 contracts [24].

2. What it is and how it's structured

Scope. NAICS 621910 covers establishments that transport patients by ground or air while providing medical care, "often provided during a medical emergency but not restricted to emergencies" [28]. It bundles three distinct businesses:

• Ground 911 (emergency) response — crews dispatched to emergencies.
• Ground non-emergency / interfacility transport — scheduled medical transports between facilities (often the higher-volume, more predictable revenue line).
• Air medical (helicopter and fixed-wing) — a separate, capital-heavy business with very different economics.

Care inside 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).

What it excludes. Transporting elderly or disabled people without medical care (e.g., wheelchair and stretcher vans with no clinical treatment) is Special Needs Transportation, NAICS 485991 — not ambulance services [28]. Government establishments that combine fire protection with ambulance or rescue service are classified under NAICS 922160 [28]. Hospital inpatient care sits in the hospital codes (NAICS 622), and hospital-run ambulance activity may be recorded under the hospital establishment; freestanding emergency-room physician services fall under offices of physicians (NAICS 6211). This code is specifically the transport-plus-treatment activity.

Ownership mix — and why it matters. Ambulance service in the U.S. is delivered through several very different models, and most of it is not run by investor-owned companies. Federal business statistics do not publish a clean public-versus-private split, but a widely cited survey of EMS agencies found roughly 41% fire-department-based, 25% private companies, 21% non-fire government, and 6% hospital-based, with the rest other [20]. In plain terms: the plurality of 911 medical response is a municipal government function (usually your local fire department), funded largely by taxes. Investor-owned firms concentrate where the economics are best — private 911 contracts, and especially the non-emergency and interfacility transport business.

3. How big it is

Our ground-truth federal figures for NAICS 621910 (private employer businesses):

That works out to average pay of roughly $52,000 per worker [1] and average receipts of about $6.8 million per firm [2] — small-business economics with one very large exception at the top. The Small Business Administration (SBA) threshold is a federal-contracting classification, not a market-size or valuation measure [3].

The undercount caveat is large here — read it. The $20.3 billion receipts figure counts only private employer businesses [2]. County Business Patterns focuses on establishments with paid employees, and the Economic Census generally excludes government-owned establishments [1][2]. So the figure largely excludes the biggest slice of U.S. ambulance activity: government-run, fire-department-based, and volunteer nonprofit EMS [20], whose budgets are funded by taxes and municipal appropriations rather than the "receipts" the Census measures, and whose crews are counted as government (not NAICS 621910) employees. Very small non-employer and volunteer squads are also hard to capture because they may have no payroll records. Commercial market estimates that fold in more of this activity put the 2024 U.S. ambulance-services market at roughly $21 billion and growing [4] — and total spending on out-of-hospital medical transport, including the tax-funded government share, is materially higher than any single "industry receipts" line implies. 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. The investable universe

Until recently there were essentially no clean public ways to own this industry. That changed in 2026. The table separates public options from the large private and other owners.

Public companies

GMR is the closest thing to a pure-play. Note the structure: KKR owned ~89% before the IPO and kept at least ~77% of the voting power afterward [5], so public shareholders are minority holders in a still-controlled, still-leveraged company. The IPO priced well below its initial range (roughly a one-third cut) and the stock fell about 10% on debut — the market's verdict on a highly indebted, thin-margin business [6][7].

Major private and other owners (not directly investable)

• Air Methods — leading air-medical operator (~300+ bases, 48 states); now owned by its former lenders after a 2023 Chapter 11 restructuring cut ~$1.7B of debt [19].
• Acadian Ambulance — large regional operator across Louisiana, Texas, and neighboring states; became 100% employee-owned via an Employee Stock Ownership Plan (ESOP) in 2024 [27].
• Falck — U.S. arm of the Danish emergency-services group, owned by Lundbeckfonden (a foundation, ~58%), KIRKBI (~28%), and Tryghedsgruppen (~14%); expanding non-emergency/Medicare Advantage transport [26].
• Priority Ambulance — PE-backed roll-up; ~560,000 patients/yr across ~14 states [25].
• PatientCare EMS Solutions and SeniorCare EMS — active private consolidators named as DocGo competitors [31].
• PHI Group — air-medical operator (previously restructured in bankruptcy).
• Municipal / fire-based / county EMS and volunteer squads — the largest single share of 911 response [20]; public and nonprofit, not investable but the dominant "competitor" for private operators.

Public investors should evaluate segment revenue, contract quality, payer mix, and cash flow rather than treating any of these names as a proxy for the whole ambulance market.

5. How the money works

Owners make money on the spread between what they collect per transport and the cost of standing ready to respond. Both halves are unusual, so understand the specific levers:

• It's a cost-of-readiness business. The dominant expense is keeping crews and vehicles staffed 24/7 whether or not calls come in. Labor is the largest cost, and readiness is largely fixed. The key operating metric is unit-hour utilization (UHU) — transports produced per staffed ambulance-hour. Higher UHU spreads fixed labor across more billable trips; low UHU (common in rural areas and in air medical) destroys margins.
• 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, meaning miles with the patient aboard [12]. Empty repositioning miles are unpaid.
• Payer mix is destiny. Reimbursement is set by who pays, not by cost. A representative payer split runs roughly 35–40% Medicare, 20–24% Medicaid, ~30% commercial, and ~10–14% self-pay/uninsured [23]. Medicare pays a national fee schedule — 80% of an approved amount after the patient's Part B deductible, with the patient owing ~20% [12][14] — and Medicaid, which has no single national ambulance fee schedule (states set their own methods), often pays far less, in many states under $300 a trip [23][33]. Industry-commissioned studies estimate the average transport is reimbursed well below its cost, with a mean shortfall on the order of $1,500 per transport across all payers [23]. Commercial insurance and self-pay collections have to subsidize the government-paid majority — and collection rates compound the problem: strong on commercial claims, weak on Medicaid, near-zero on uninsured self-pay [23].
• Subsidies and contracts fill the gap. Because fee-schedule revenue alone rarely covers cost, operators lean on municipal subsidies and exclusive 911 contracts (a city pays a fee, or grants a monopoly service area, to guarantee coverage), on hospital/facility contracts for interfacility work, and on Medicaid supplemental "GEMT" (Ground Emergency Medical Transportation) payments that reimburse public providers closer to cost [23]. Winning and keeping these contracts is the core commercial skill.
• Air medical is a different animal. A helicopter base is a very high fixed cost flown at low utilization, historically monetized through very large out-of-network commercial charges — median billed air-ambulance amounts of roughly $36,000–$40,000 against operating costs a fraction of that [18]. Some air operators also sell membership/subscription plans to households. That charge-based model has been squeezed hard by regulation (see below), which is why two of the largest air operators restructured their debt [19].

Operators track transports by payer/geography/service level, net collections and days-to-collect, revenue per staffed unit-hour, crew-fill and turnover, contract renewal/bid-win rates, denials and uncompensated care, and fleet age and replacement capital. The federal statistics above provide none of these operating measures — they come from company diligence.

Bottom line for owners: profit comes from scale (spreading readiness cost), a commercial-heavy payer mix, disciplined revenue-cycle management (getting claims paid), and durable municipal/facility contracts — not from Medicare and Medicaid rates, which alone lose money.

6. What drives demand

• Demographics. An aging population is the structural tailwind. The U.S. population aged 65 and older reached 61.2 million in 2024, or 18.0% of the population [29]. Older Americans generate far more 911 calls, hospitalizations, and — critically — the scheduled interfacility and dialysis transports that make up the steadier, more profitable volume.
• 911 call volume and acuity. Baseline emergency demand — accidents, cardiac events, strokes, overdoses — is large and stable; EMS systems field tens of millions of activations a year [20]. Volume is relatively insensitive to the economy, which is what makes the top line defensive.
• Interfacility transfer growth. As hospital networks centralize specialty care and manage discharges, patients get moved between facilities more often — a demand source tied to health-system structure rather than emergencies.
• Hospital and facility outsourcing. Health systems, municipalities, and health plans increasingly contract transport out rather than run their own fleets, feeding the private operators.
• Rural distance. Long trips to hospitals and specialty care raise both demand and the cost of maintaining readiness at low volume [12].
• New care models. Mobile integrated healthcare and community paramedicine — sending crews to treat patients at home or divert them from the ER — are an emerging, largely non-fee-schedule revenue line. Whether these become a major profit source depends on payers agreeing to reimburse "treatment without transport," which today they largely do not.

Demand is therefore relatively defensive, but demand stability does not guarantee margin stability.

7. Regulation

Ambulance economics are set more by regulators and legislators than by markets, across fragmented federal, state, and local authority. The pressure points:

• Medicare fee schedule (CMS). The national Ambulance Fee Schedule (AFS) sets base and mileage rates and is the reference point every other payer negotiates around [12][13]. It includes temporary add-on payments — roughly +3% for rural-origin trips, +2% urban, and +22.6% for "super-rural" — that Congress must periodically renew; the current extension runs through December 31, 2027 and expires January 1, 2028 absent further action [12][13]. Letting these lapse is a recurring revenue cliff.
• Medicare cost data collection. CMS runs a Ground Ambulance Data Collection System (GADCS) requiring sampled providers to report cost, revenue, utilization, and staffing data — the groundwork for judging whether fee-schedule rates are adequate. Selected providers that fail to report face a 10% Medicare payment reduction the following year, subject to exemptions and review [30].
• Medicaid. No national ambulance fee schedule exists; states set their own payment methods and rates within federal rules, generally below Medicare, with supplemental GEMT programs for public providers [23][33].
• The No Surprises Act — and the ground-ambulance loophole. The 2022 federal balance-billing ban covers air ambulances (patients now owe only in-network cost-sharing for a covered air transport) but explicitly excludes ground ambulances [15][18], because ground rates are set by a patchwork of state and local rules. Ground ambulance is now one of the most common sources of surprise medical bills [17].
• The pending fix. A federal Advisory Committee on Ground Ambulance and Patient Billing (GAPB) delivered recommendations to Congress on August 28, 2024, proposing to cap patient cost-sharing and bar balance billing for ground transports, with out-of-network payments benchmarked first to state/local rates [16]. Roughly a dozen-plus states have already passed their own ground-ambulance billing protections [15]. Whichever way federal legislation lands, it directly affects how much operators can collect on commercial claims — the very revenue that cross-subsidizes the business.
• State licensing and service areas. States and localities control ambulance licensing, clinician credentials, scope of practice, medical direction, response-time rules, and — via exclusive-operating-area or certificate-of-need regimes — who is allowed to run 911 in a given jurisdiction [11]. Air ambulances add federal aviation oversight (FAA safety; the Airline Deregulation Act has historically preempted states from regulating air-ambulance rates, which is why the surprise-billing fix had to come from Congress).

8. Competitive dynamics and consolidation

• Fragmented, with a consolidating top. Thousands of firms compete; the top four hold ~35% of private revenue and the top 50 hold ~58% [2] — leaving a very long tail of local operators. That gap is the roll-up thesis, though the suppressed HHI prevents a fuller concentration read [2].
• Competition is for contracts, not walk-in customers. Growth comes from winning exclusive municipal 911 franchises and hospital/skilled-nursing transport contracts, on response-time performance, service-area density, payer-network access, and billing/clinical quality. Scale improves dispatch efficiency, fleet purchasing, training, backup coverage, and billing infrastructure — the advantages behind buy-and-build.
• Private equity has been the consolidator. For a decade, PE-backed platforms have bought local operators to gain billing scale, dispatch density, and negotiating leverage [24]. GMR itself is a KKR creation — Air Medical Group Holdings (bought 2015) merged with AMR (bought from Envision for $2.4B in 2017) [5]. Other consolidators include Priority Ambulance and PatientCare [24][25].
• Why there's no single national winner. Tax-funded fire and municipal EMS dominate emergency response [20], and volunteer systems, hospital operators, and local procurement all limit any one firm's reach. As municipal budgets tighten, public-private partnerships can expand the private opportunity — but they also politicize pricing.
• Air medical consolidated separately and painfully. The high-charge air model drew heavy consolidation and leverage, then the No Surprises Act — culminating in Air Methods' 2023 bankruptcy and debt hand-over to lenders [19].

9. Risks

• Reimbursement below cost. The structural problem: government payers, the volume majority, pay less than it costs to serve them [23]. Any Medicare/Medicaid rate pressure hits directly.
• Add-on renewal and Medicaid-cut risk. Temporary Medicare add-ons must be re-legislated (next cliff Jan 1, 2028) [12][13], and state Medicaid budgets and GEMT programs are perennial cut targets — revenue the industry cannot control.
• Surprise-billing legislation. A federal ground-ambulance balance-billing ban [16] would cap the out-of-network commercial charges that currently cross-subsidize the business — a clear downside to collections, with magnitude depending on the payment benchmark chosen.
• Leverage. PE ownership left several of the largest operators heavily indebted. GMR needed a ~$5.4B refinancing in 2024–2025 to push out maturities [10], and both Air Methods and PHI restructured through bankruptcy [19]. High fixed costs plus high debt is fragile in a downturn or rate shock.
• Labor. Chronic EMT/paramedic shortages, ~20–30% annual turnover, and wage inflation squeeze the largest cost line [21][22]. Median pay was about $41,340 for EMTs and $58,410 for paramedics in 2024 [21], and a majority of agencies report they cannot fully staff to demand; hospitals poaching paramedics worsens the pipeline [22].
• Contract concentration. Loss of a major 911 or hospital contract can strand a region's fixed cost overnight while its revenue disappears.
• Compliance. Weak medical-necessity documentation, coding, billing, or GADCS reporting can trigger denials, repayment demands, or payment reductions [25][30].
• Fleet, safety, and liability. Ambulances and aircraft require recurring capital, maintenance, insurance, and safety investment; clinical errors, accidents, or billing disputes can damage contracts and financing access.
• Air-ambulance model compression. Post-No Surprises Act, the historic high-charge revenue model is impaired [18][19]; air remains a low-utilization, high-fixed-cost business exposed to fuel prices and aviation-safety incidents.

10. How to invest, and the outlook

Public routes.

• Global Medical Response (NYSE: GMRS) is the only large, near-pure-play public bet on U.S. ambulance services [8]. Understand what you are buying: the market leader, but a KKR-controlled, still-leveraged, thin-margin operator whose IPO priced at a steep discount and fell on debut [5][6][7]. The case rests on scale advantages, revenue-cycle execution, and deleveraging — and is exposed directly to the reimbursement and surprise-billing decisions above.
• DocGo (Nasdaq: DCGO) offers indirect, diversified exposure — ambulance transport is one line inside a broader technology-enabled mobile-health model [11][31], so it is more a bet on the care-delivery model than on transport economics.
• ModivCare (Nasdaq: MODV) is adjacent, not ambulance: NEMT coordination and supportive care rather than transport operations [32]. Separate ambulance revenue from these other businesses before treating any of them as a proxy.
• There is no dedicated ambulance ETF; broad healthcare-services funds give only trace exposure.

Private routes. This remains primarily a private-market industry [20]. Access comes through PE healthcare-services funds (the consolidators), direct ownership or roll-up of regional operators, private credit, and capital or services to municipal EMS contractors. The fragmentation that makes the sector hard also makes it a durable roll-up hunting ground [2][24]. Diligence should center on: contract duration, exclusivity, renewal history, and bid calendars; transport volume and service-level mix; payer mix, net collections, denials, and receivables; crew availability, overtime, and turnover; unit-hour utilization and response performance; fleet age and replacement capital; medical-director, licensing, and billing-audit arrangements; and customer concentration, debt structure, and integration plans.

Near-term drivers to watch (forward-looking). The single biggest swing factor is federal ground-ambulance surprise-billing legislation — the GAPB recommendations are with Congress, and the payment benchmark chosen would set how much operators can collect from commercial payers for years [16]. Second, watch Medicare add-on renewals (the Jan 2028 cliff) and Medicaid/GEMT funding, the industry's recurring policy cliffs [12][13][23]. Third, watch GMR's post-IPO deleveraging and margins as the first public read on whether scale can overcome this sector's structural reimbursement math [9][10].

Editor's judgment. Demand is secularly supported by aging demographics and rising interfacility volume, but returns will be made or lost on policy and payer mix, not on volume — a defensive top line wrapped around a genuinely difficult margin and balance-sheet problem. The best operators combine durable contracts, reliable staffing, disciplined billing, dense local coverage, and moderate leverage. The central investment question is not how many calls an operator receives; it is whether it can convert required readiness into durable, collectible cash flow.

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Sources

1. 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
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. Small Business Administration, Table of Small Business Size Standards (2023) — $22.5M receipts standard for NAICS 621910. https://www.sba.gov/document/support-table-size-standards
4. Grand View Research, U.S. Ambulance Services Market Size, Industry Report (2024). https://www.grandviewresearch.com/industry-analysis/us-ambulance-services-market-report
5. Reuters (via Investing.com), "KKR-backed ambulance giant GMR raises $478.7 million in US IPO" (2026) — IPO size, price, share count, valuation, KKR ownership/voting. https://www.investing.com/news/stock-market-news/kkrbacked-ambulance-giant-gmr-raises-4787-million-in-us-ipo-4683074
6. U.S. News / Reuters, "KKR-Backed Ambulance Giant GMR Valued at $3 Billion as Shares Fall in NYSE Debut" (2026). https://money.usnews.com/investing/news/articles/2026-05-13/kkr-backed-ambulance-giant-gmr-shares-fall-10-in-nyse-debut
7. IPOScoop, "GMR Solutions (GMRS) Prices IPO at $15 — Big Price Cut — & Stock Sinks on the NYSE" (2026). https://www.iposcoop.com/the-ipo-buzz-gmr-solutions-gmrs-prices-ipo-at-15-big-price-cut-in-the-prospectus/
8. Global Medical Response, "GMR Solutions Inc. Announces Pricing of its Initial Public Offering" (2026) — NYSE: GMRS, scale, counties/population coverage. https://www.globalmedicalresponse.com/news/gmr-solutions-inc-announces-pricing-of-its-initial-public-offering
9. Private Equity Insights, "KKR-backed Global Medical Response lists at $3.3bn after cutting IPO price" (2026) — 2025 revenue $5.74B, net income $206.2M, adjusted EBITDA, encounters, clinicians. https://peinsights.substack.com/p/kkr-backed-global-medical-response
10. Kirkland & Ellis / Bloomberg Law, "KKR-Backed Global Medical Response — $5.4 Billion Comprehensive Refinancing" (2024–2025). https://www.kirkland.com/news/press-release/2025/09/kirkland-represents-kkr-backed-global-m-response-on-a-5-4-b-comprehensive-refinancing-transaction
11. DocGo Inc., "DocGo Announces Fourth Quarter and Full-Year 2024 Results" (2025) — $616.6M FY2024 revenue; Nasdaq: DCGO; mobile health + ambulance (Ambulnz). https://www.businesswire.com/news/home/20250227149161/en/DocGo-Announces-Fourth-Quarter-and-Full-Year-2024-Results
12. Medicare Payment Advisory Commission (MedPAC), Payment Basics: Ambulance Services Payment System (2024) — fee schedule, 80%/20%, loaded miles, rural/urban/super-rural add-ons, data collection. https://www.medpac.gov/wp-content/uploads/2024/10/MedPAC_Payment_Basics_24_ambulance_FINAL_SEC.pdf
13. Centers for Medicare & Medicaid Services, Ambulance Fee Schedule (2026) — add-on payments extended through Dec. 31, 2027. https://www.cms.gov/medicare/payment/fee-schedules/ambulance
14. Medicare.gov / American Ambulance Association, Ambulance coverage & Part B deductible (2024). https://www.medicare.gov/coverage/ambulance-services
15. The Commonwealth Fund, "Expanding the No Surprises Act to Protect Consumers from Surprise Ambulance Bills" (2024) — ground-ambulance NSA exclusion; state laws. https://www.commonwealthfund.org/blog/2024/expanding-no-surprises-act-protect-consumers-surprise-ambulance-bills
16. Centers for Medicare & Medicaid Services, Advisory Committee on Ground Ambulance and Patient Billing (GAPB) — Report to the Secretaries, recommendations (Aug. 28, 2024). https://www.cms.gov/medicare/regulations-guidance/advisory-committees/advisory-committee-ground-ambulance-patient-billing-gapb
17. Peterson-KFF Health System Tracker, "Ground ambulance rides and potential for surprise billing". https://www.healthsystemtracker.org/brief/ground-ambulance-rides-and-potential-for-surprise-billing/
18. U.S. Dept. of Health & Human Services (ASPE), Air Ambulance Use and Surprise Billing issue brief (2021) — median billed cost; NSA covers air ambulances. https://aspe.hhs.gov/sites/default/files/2021-09/aspe-air-ambulance-ib-09-10-2021.pdf
19. Davis Polk / Bloomberg, "Air Methods files Chapter 11 (Oct. 24, 2023); emerges Dec. 2023" — ~$1.7B debt reduction, lender ownership, No Surprises Act impact. https://www.davispolk.com/experience/air-methods-emerges-chapter-11
20. Haverford College (Troske et al.), Ambulance Service Ownership and Management (2018) — EMS agency ownership mix (fire 41% / private 25% / non-fire gov 21% / hospital 6%); 911 volume. https://www.haverford.edu/sites/default/files/Department/Economics/ambulance-service-ownership-2018.pdf
21. U.S. Bureau of Labor Statistics, Occupational Outlook Handbook: EMTs and Paramedics (May 2024) — median wages ($41,340 EMT / $58,410 paramedic). https://www.bls.gov/ooh/healthcare/emts-and-paramedics.htm
22. National Association of EMTs / NY State Comptroller reports, EMS Workforce Crisis (2024–2025) — turnover 20–30%, understaffing, pipeline decline. https://www.osc.ny.gov/files/local-government/publications/pdf/ems-report-2024.pdf
23. EMS1 / Northeast Colorado RETAC & American Ambulance Association data, EMS Payer Mix and Reimbursement Gap (2024) — payer mix, per-transport shortfall, GEMT. https://www.ems1.com/ems-trend-report/quantifying-the-gap-between-expenses-and-revenue-for-ems-services
24. The American Prospect, "Private Equity Chases Ambulances" — PE roll-up dynamics, GMR/KKR history, consolidators. https://prospect.org/health/private-equity-chases-ambulances-emergency-medical-transport/
25. Priority Ambulance, Family of Companies / JEMS — ~560,000 patients/yr across ~14 states. https://priorityambulance.com/family-of-companies/
26. Falck, Ownership (Lundbeckfonden ~58% / KIRKBI ~28% / Tryghedsgruppen ~14%) and Falck U.S. Services — non-emergency/Medicare Advantage expansion. https://www.falck.com/about-us/who-are-we/ownership/
27. Acadian Ambulance, Our Company (2025) — 100% employee-owned via ESOP (2024). https://acadianambulance.com/our-company/
28. NAICS Association / U.S. Census Bureau, NAICS 621910 — Ambulance Services definition and cross-references to 485991 (Special Needs Transportation) and 922160 (government fire/ambulance). https://www.naics.com/naics-code-description/?code=621910
29. 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
30. Centers for Medicare & Medicaid Services, Medicare Ground Ambulance Data Collection System (GADCS) (2026) — reporting requirement; 10% payment reduction for non-reporting. https://www.cms.gov/medicare/payment/fee-schedules/ambulance/medicare-ground-ambulance-data-collection-system
31. U.S. Securities and Exchange Commission, DocGo Inc. Form 10-K — Ambulnz business; competitors named (Priority Ambulance, PatientCare, SeniorCare EMS). https://www.sec.gov/Archives/edgar/data/1822359/000162828026018214/dcgo-20251231.htm
32. U.S. Securities and Exchange Commission, ModivCare Inc. Form 10-K for FY2024 (2025) — NEMT coordination, personal care, monitoring. https://www.sec.gov/Archives/edgar/data/1220754/000122075425000008/modv-20241231.htm
33. Medicaid.gov, Assurance of Transportation — states set their own transportation payment methods within federal rules. https://www.medicaid.gov/medicaid/benefits/assurance-of-transportation