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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 for members/enrollees of Ambetter Nevada (Centene-affiliated health plans). Applies to requests for emergent and interfacility air transport when ground or water transport is inappropriate or unavailable.
No material clinical or coverage changes in this revision.
Coverage and Medical Necessity Criteria
Medically necessary air ambulance transport
Covered when ALL of the following are met:
Examples include: intracranial bleeding requiring neurosurgical intervention; cardiogenic shock; burns requiring a burn center; conditions requiring hyperbaric oxygen treatment; multiple severe injuries; life-threatening trauma; cerebrovascular infarction requiring tPA at a certified stroke center.
Inaccessible locations include remote or sparsely populated areas (e.g., Hawaii, Alaska, or other locations where ground/water access is not feasible).
Not medically necessary
Not medically necessary when ANY of the following apply:
Transport to a non-acute care facility is explicitly excluded from medical necessity for air ambulance services. Examples of such non-acute destinations include a nursing facility, physician's office, or the member's home. Air transport to these locations does not meet the policy's coverage criteria and should be considered an exclusion when evaluating claims or prior authorization requests.
Air ambulance transport is not medically necessary in several specific circumstances: when the member was legally pronounced dead before the ambulance was called; when transportation is provided primarily for convenience of the member, family, or physician; or when the transport is to receive a service that has been determined to be not medically necessary, even if the destination facility would otherwise be appropriate. These scenarios should be used to deny coverage or prior authorization requests per policy.
Billing Codes and Coding Guidance
| 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) |
Provider Requirements, Documentation, and Billing Notes
Prior‑authorization: submit medical necessity plus referenced HCPCS codes
Document and submit clinical evidence that supports medical necessity per policy criteria and include the HCPCS codes listed for air ambulance billing: A0430, A0431, A0435, A0436, S9960, and S9961. Ensure claims reference the transport type (fixed vs. rotary), mileage, and clinical rationale that ground transport would endanger the member or threaten survival, or that the transferring facility lacks required specialty services.
- Cite specific clinical condition(s) from policy (e.g., intracranial bleeding, cardiogenic shock, burns, life‑threatening trauma, need for tPA).
- Include pick‑up location details and travel-time or distance justification (e.g., ground travel >30–60 minutes, inaccessibility).
- Report transport type (fixed or rotary wing) and mileage using the appropriate HCPCS mileage codes (A0435 or A0436).
Action: document clinical rationale and bill with the correct HCPCS codes
When billing or requesting authorization, providers must document the specific clinical and logistical reasons for air transport and include the applicable HCPCS codes; failure to document both medical necessity and the required coding details may result in claim denial or delay.
Documentation requirement: justify why ground transport would endanger the member
Document that ground basic or advanced life support transport would endanger the member or threaten survival, or that the pickup location is inaccessible or ground travel time (e.g., >30–60 minutes) would be excessive; also document when a transferring facility lacks required specialty services. Include transport type (fixed vs. rotary) and mileage in the record and claim submission.
- Record the clinical condition meeting medical necessity examples (e.g., intracranial bleeding, cardiogenic shock, burns needing burn center, need for tPA).
- Document pickup location access issues or estimated ground travel time and obstacles (traffic, distance).
- Specify fixed wing vs. rotary wing and include mileage codes (A0435 or A0436) when applicable.
Denial risk: exclusions where air ambulance is not medically necessary
Air ambulance is not medically necessary and should not be billed if the member was legally pronounced dead before the ambulance was called, if transport was primarily for convenience, or if the destination is a non‑acute care facility (e.g., nursing facility, physician's office, or home); claims submitted under these circumstances risk denial.
- Do not bill air ambulance when member was pronounced dead prior to call.
- Do not bill for transports primarily for convenience of member/family/physician.
- Do not bill air ambulance for transport to non‑acute care facilities.
Background and Context
Air ambulances — both fixed wing (airplane) and rotary wing (helicopter) — are used to rapidly transport critically ill patients when ground or water transport is inappropriate or unavailable. Rotary wing aircraft are often used for scene responses and shorter-range transfers, while fixed wing aircraft are generally used for longer-distance, facility-to-facility transports and can provide a more hospital-like environment. Air transport is indicated when ground/basic or advanced life support transport would endanger the member's health or threaten survival, when pickup locations are inaccessible by ground or water, when obstacles or travel times (e.g., 30–60 minutes) make ground transport impractical, or when the transferring facility lacks required specialty services.
Key Definitions
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