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Clinical Policy: Air Ambulance
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Medical necessity criteria and coding guidance for fixed-wing and rotary-wing air ambulance transport when ground or water ambulance transport is inappropriate; applies to health plans affiliated with Centene Corporation and their members/enrollees.
No material clinical or coverage changes in this revision.
Medical Necessity and Exclusions for Air Ambulance
Primary medical necessity criteria
Air ambulance (fixed or rotary wing) is medically necessary when ALL of the following are met:
Overall medical necessity
- Clinical severity examples: Member has one or more clinical conditions that would be endangered by ground transport (examples include intracranial bleeding requiring neurosurgical intervention; cardiogenic shock; burns requiring treatment in a burn center; conditions requiring treatment in a Hyperbaric Oxygen Unit; multiple severe injuries; life‑threatening trauma; cerebrovascular infarction needing tPA at a certified stroke center).
Examples are illustrative, not exhaustive.
- Location/pickup criteria: Point of pickup is inaccessible by ground or water ambulance OR great distances/obstacles (including traffic) such that ground transport travel time to the nearest appropriate hospital with required services exceeds 30 to 60 minutes.30-60 minutes travel time
Includes remote areas such as Hawaii, Alaska, and other sparsely populated continental areas; includes water access limitations where applicable.
- Interfacility transfer criteria: Transferring facility does not have the appropriate services and physician specialists to provide necessary medical care (e.g., trauma unit, burn unit, cardiac care unit, pediatric specialty services).
See policy exclusions for full details.
Air ambulance transports that do not meet the medical necessity criteria are subject to exclusion. Specifically, air transport is not medically necessary when the member/enrollee was legally pronounced dead before the ambulance was called, when transportation is provided primarily for convenience of the patient, family, or physician, or when the destination is a non-acute care facility such as a nursing facility, physician’s office, or the member’s home. Additionally, air transport to receive a service that itself is not medically necessary is excluded even if the receiving facility would otherwise be appropriate.
When documenting and requesting review or authorization, include specific clinical details that demonstrate why ground or water ambulance would endanger the member’s health or survival, and why the pickup location or transfer circumstances meet the policy’s access/distance or facility-capability criteria. Lack of such documentation is a frequent basis for denial.
Air ambulance transport is not medically necessary in the following situations: the member/enrollee was legally pronounced dead before the ambulance was called; the transport is provided primarily for convenience of the member, family, or physician; transport to a non-acute care facility (for example, a nursing facility, physician’s office, or the member’s home); or transport to obtain a service that is not medically necessary, even if the destination facility would otherwise be appropriate.
Prior Authorization, Documentation, and Billing Guidance
Prior authorization and coding note
Air ambulance transports that meet the policy's medical necessity criteria must follow the Health Plan's prior authorization process where applicable. Claims must use the referenced HCPCS codes (A0430, A0431, A0435, A0436, S9960, S9961) when billing for air ambulance services.
Provider request requirement — confirm medical necessity and access/transfer criteria
Ensure that air transport is requested only when ground or water ambulance would endanger the member's health or threaten survival and when pickup or transfer conditions meet the policy's access, distance, or facility-capability criteria.
- Request air ambulance only when criteria in Section I (clinical severity, pickup/access, or interfacility capability gaps) are met.
- Do not rely on convenience or non-acute destinations as justification for air transport.
Required documentation elements
Document the clinical condition and supporting details that demonstrate ground or water ambulance would endanger the member's health or survival, plus any pickup/access limitations or facility capability gaps for interfacility transfers.
- Clinical findings or diagnoses (examples: intracranial bleeding requiring neurosurgery, cardiogenic shock, burns needing a burn center, conditions needing hyperbaric oxygen, multiple severe injuries, life‑threatening trauma, cerebrovascular infarction needing tPA).
- Evidence that the pickup location is inaccessible by ground/water or that ground transport travel time to an appropriate hospital would exceed 30–60 minutes.
- For interfacility transfers, documentation that the transferring facility lacks required services or physician specialists (e.g., trauma unit, burn unit, cardiac care unit, pediatric specialty services).
- Include applicable HCPCS codes on claims.
Common denial triggers
Transports requested for convenience, to non‑acute destinations, or when the member was legally dead before the ambulance was called are common reasons for denial as not medically necessary.
- Transportation provided primarily for the convenience of the member, family, or physician.
- Transport to non-acute care locations (e.g., nursing facility, physician's office, or home).
- Member was legally pronounced dead before the ambulance was called.
HCPCS Codes and Billing Codes Referenced
| A0430 | Ambulance service, conventional air services, transport, one way (fixed wing) |
| A0431 | Ambulance service, conventional air services, transport, one way (rotary wing) |
| A0435 | Fixed wing air mileage, per statute mile |
| A0436 | Rotary wing air mileage, per statute mile |
| S9960 | Ambulance service, conventional air services, nonemergency transport, one way (fixed wing) |
| S9961 | Ambulance service, conventional air service, nonemergency transport, one way (rotary wing) |
Air Ambulance Types
Background and Usage
Air ambulance (rotary or fixed wing) is used to rapidly transport critically ill or injured patients when ground or water transport is inaccessible or would endanger the patient’s health or threaten survival. Rotary wing (helicopter) is typically used for scene response and shorter-range transfers; fixed wing (airplane) is used for longer-range facility-to-facility transports and can provide advanced onboard monitoring and life support. Air transport is particularly beneficial for major trauma and other time-sensitive critical conditions, and is commonly used in rural or remote areas where access to advanced care is limited. Approximately 550,000 patients in the U.S. use air ambulance services annually.
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