Critical Access Hospital Ambulances: Who Qualifies for Cost-Based Payment?

The critical access hospital ambulance 35 mile rule helps determine whether Medicare pays a hospital’s ambulance service based on its costs instead of the fee schedule. The patient may need the ambulance, and the crew may describe the trip accurately, while the hospital’s eligibility for that payment method remains a separate question. If you work in hospital finance or operate an ambulance service nearby, the important discrepancy may be in the hospital’s account of its own operation and its neighbors. The run report tells only part of the payment story.

What Is the Difference Between Fee-Schedule Payment and Cost-Based Payment?

The Medicare ambulance fee schedule prices covered ambulance services under a national payment system. Cost-based payment instead ties reimbursement to reasonable costs. The Centers for Medicare & Medicaid Services’ ambulance payment overview applies the fee schedule broadly to volunteer, municipal, private and independent ambulance suppliers, as well as institutional providers. It identifies a critical access hospital exception tied to whether another ambulance service is nearby.

The exception pays qualifying critical access hospital ambulance services at 101% of reasonable cost, rather than the fee-schedule amount. The financial question therefore reaches beyond the service code on an individual claim. It includes whether the organization qualified to receive reimbursement on that basis at all.

That distinction matters in a business whose costs vary with its workload. In a 2012 report examining ambulance costs, the Government Accountability Office found that higher transport volume was associated with lower costs per transport in its sample. Personnel were the largest cost component reported for the study year. For a hospital finance employee, that is why eligibility for cost-based payment belongs alongside the ambulance budget: the hospital is asking Medicare to pay according to its costs.

What Is the Critical Access Hospital Ambulance 35 Mile Rule?

For cost reporting periods beginning on or after October 1, 2019, the critical access hospital payment rule requires the hospital or its owned and operated entity to be the only ambulance provider or supplier within a 35-mile drive of the hospital. It excludes other services that lack legal authority to transport patients to or from that hospital.

The regulation measures the shortest distance over improved roads between the hospital or its entity and the site where the closest other ambulance provider or supplier garages its vehicles. Improved roads must be maintained by a local, state or federal government and open to the general public. The measurement includes the paved surface up to the hospital’s front entrance and the garage’s front entrance. We compare the hospital’s route and garage locations with that prescription, rather than a circle drawn on a map.

For cost reporting periods beginning from October 1, 2011, through September 30, 2019, the rule used the hospital as the reference point but did not state the exclusion for legally unauthorized services. For periods beginning from January 1, 2004, through September 30, 2011, the test referred to a drive from the hospital or its entity. The road and entrance prescription applies across the regulation’s ambulance provisions, so the period and the operation both belong in the comparison.

Who Owns and Operates the Ambulance Service?

The cost-based exception reaches a qualifying hospital’s ambulance service and an entity the hospital owns and operates. A separate provision covers an owned and operated entity more than a 35-mile drive away: there must be no ambulance provider or supplier within a 35-mile drive of the hospital, and the distant entity must be the closest ambulance provider or supplier to it. The regulation includes that provision for cost reporting periods beginning on or after October 1, 2011, and retains it in the paragraph governing periods beginning on or after October 1, 2019. Ownership alone does not answer the location question.

The Centers for Medicare & Medicaid Services uses a broader definition of a hospital-based ambulance provider in its claims manual: a service owned or operated by an institution. Its description of the cost-based exception uses both ownership and operation for a separate hospital entity. For an insider, that wording makes the operating agreement worth reading alongside the ownership documents.

The manual also recognizes independent companies, volunteer services and local-government ambulance operations as suppliers. For periods covered by the current exclusion, we examine each nearby service’s legal authority to transport patients to or from the hospital alongside its garage location. The operation’s name or organizational form does not answer both questions.

Which Records Show Whether the Hospital Qualified?

The useful records connect the claimed payment method to the organization that furnished the transport. A health care finance employee may know what the hospital told Medicare, while a local ambulance operator may know which services were actually operating nearby.

The CMS manual supplies a concrete example in its Indian Health Service and Tribal hospital billing instructions. It identifies condition code B2, the CAH ambulance attestation, for qualifying hospitals claiming the distance-based exception. For an insider reviewing those bills, the attestation connects the claim to what the hospital said about its eligibility.

We bring the claim and the operation together around specific questions:

• Ownership and operation: Do the ownership documents and operating agreements describe the same entity the hospital identified for cost-based payment, including any distant entity it says is the closest service?
• Nearby services: Which operations appear in the hospital’s eligibility documents, and what do their licenses or other authorizations say about transporting patients to or from that hospital?
• Locations and distance: Do the garage records and route calculations use the shortest distance over qualifying roads, including the specified hospital and garage entrances?
• Payment and timing: Do the cost reports, submitted claims, eligibility statements and payment records describe the same operation, and which version of the test applies to the cost reporting period?

These comparisons give an insider’s concern something concrete to attach to. The central issue is what the hospital represented to obtain payment, what its own records show and who understood any difference. We work through those connections with you, including how the payment requirements applied to the period involved.

An Outside Crew Can Furnish a Hospital’s Transport

A hospital can arrange for an outside ambulance supplier to perform a transport that the hospital furnishes and bills. The HHS Office of Inspector General’s ambulance guidance describes arrangements in which Medicare pays the hospital, skilled nursing facility or critical access hospital, and the ambulance supplier should not also bill Medicare for that transport.

The claims manual gives a concrete critical access hospital example. A patient who remains an inpatient may need transportation elsewhere for specialized care. When that transportation is included in the inpatient service paid under Part A, it cannot also be paid as a separate Part B ambulance service.

For a critical access hospital finance employee, an outside supplier’s invoice and the hospital’s Medicare claim describe different sides of the same arrangement. We follow both to see who Medicare paid and whether the supplier also billed for the transport. The same separation matters in ambulance consolidated billing, where an institutional payment and a supplier’s separate claim can cover the same transport.

When the Payment Method Does Not Match the Operation

The general ambulance payment rule puts ambulance services under the fee schedule except for qualifying critical access hospitals and their owned and operated entities. We read the hospital’s payment records against the eligibility conditions for its cost reporting period, including the applicable treatment of nearby services and any distant owned entity.

Medical necessity answers why the patient needed an ambulance. The eligibility documents answer why Medicare should pay the organization on a cost basis. When a hospital obtains payment through a false account of its operation, taxpayers fund the claim. We look for the connection between that misrepresentation and the Medicare money it produced.

A whistleblower case under the False Claims Act can pay 15% to 30% of what the government recovers. If the hospital’s account conflicts with the operation you know, speak to one of our Whistleblower Experts about what management knew.

When You Know the Ambulance Operation Behind the Claims

If you work with the hospital’s ambulance finances or know the nearby services its eligibility account left out, speak to one of our Whistleblower Experts about the operation behind the claims. We connect those facts to the Medicare money and bring in healthcare fraud whistleblower lawyers who understand hospital reimbursement to build your strongest whistleblower case. You have us beside you throughout, working through the payment questions with you and the whistleblower lawyers we bring in.