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Air Ambulance
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Defines medical necessity criteria and coding guidance for fixed-wing and rotary-wing air ambulance transports for members/enrollees of Centene-affiliated health plans; applies to providers requesting or billing for air medical transport.
Under I.A.7. the examples were expanded to explicitly include cerebrovascular infarction with the need for tissue plasminogen activator (tPA) at a certified stroke center.
Description and Criteria I.B.1. updated to include water ambulance accessibility.
Criteria I.B.2. updated for clarity regarding travel time and distance thresholds (30 to 60 minutes) to nearest appropriate facility.
Coverage Criteria
Medically necessary criteria
Covered when ALL of the following are met
Policy I.
Includes but not limited to examples listed in A.1–A.7
Policy I.A
Policy I.B.1–I.B.2
Policy I.C
Air ambulance transportation is not medically necessary when it is provided primarily for convenience rather than clinical need. Examples include transport arranged for the convenience of the member/enrollee, the member's/enrollee's family, or the physician. Transportation to non-acute care settings such as a nursing facility, physician's office, or the member's/enrollee's home is also considered not medically necessary.
Additional conditions that render air ambulance transport not medically necessary include situations where the member/enrollee was legally pronounced dead before the ambulance was called, and when the transport is solely to receive a service that is itself deemed not medically necessary, even if the destination is an otherwise appropriate facility.
Coding and Transport Thresholds
| 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 Actions and Documentation
Prior Authorization Required
Prior Authorization Required — Air ambulance transports should be supported by documentation showing the criteria for medical necessity. Prior authorization may be required by the health plan; when required, submit clinical rationale demonstrating that ground transport would endanger the member or that the pickup location is inaccessible or travel time to an appropriate facility would exceed acceptable limits. Include transferring facility documentation when transport is between facilities and the originating facility lacks required specialty services.
- Provide clinical notes describing the patient's condition and why ground transport is unsafe
- Include facility capability documentation when transferring between hospitals (e.g., lack of burn unit, trauma center, stroke center)
- If applicable, document geographic barriers or estimated ground transport time >30–60 minutes
- Attach prior authorization number or evidence of emergent retrospective review when authorization was not obtainable
Claims Documentation and Coding Guidance
Claims must reference the appropriate HCPCS and CPT/HCPCS modifiers and follow current professional coding guidance. Use the codes below for billing air ambulance services and include required supporting documentation in the medical record and on the claim to substantiate the level of service billed.
- Use HCPCS A0430 (fixed wing, one way) or A0431 (rotary wing, one way) as applicable
- Report mileage with A0435 (fixed wing mileage) or A0436 (rotary wing mileage) per statute mile
- For nonemergency air transports, consider S9960 (fixed wing) or S9961 (rotary wing) where appropriate
- Reference the most current CPT/HCPCS manuals and state Medicaid billing guidance prior to claim submission
Denial Risk and Common Documentation Deficiencies
Provide the documentation elements most commonly requested during review to reduce denial risk. Claims lacking adequate clinical documentation or billing of air ambulance when ground transport was appropriate are common denial triggers.
- Clinical documentation of the acute condition and why ground transport would endanger the patient (examples: intracranial bleeding needing neurosurgery, cardiogenic shock, life‑threatening trauma, need for burn or hyperbaric care)
- Transport origin/destination details and reasons facility-to-facility transfer is necessary (document unavailable specialty services)
- Geographic or time-based justification for air transport (inaccessibility by ground, remote location, or ground transport time >30–60 minutes)
- Complete and accurate HCPCS/CPT codes and, when applicable, modifiers and mileage entries
- Avoid billing air ambulance for convenience, non‑acute transfers, or transports to non‑acute care facilities (e.g., nursing facility, physician office, home)
Provider Operational Actions
Provider actions — operational checklist to support prior authorization and claims processing.
- Obtain prior authorization when required; if emergent transport occurs without prior approval, submit retrospective review documentation promptly
- Ensure medical records include time‑stamped clinical notes, physician orders, and transport crew notes that justify air transport level
- Attach facility capability statements or transfer agreements when transferring to a higher level of care
- Verify and bill the correct HCPCS codes (A0430, A0431, A0435, A0436, S9960, S9961) and include mileage and modifiers per current coding guidance
- Retain and provide documentation of contraindications to ground transport (e.g., scene inaccessibility, life‑threatening instability) for audit/appeal processes
Definitions
Background
Air ambulances include both fixed-wing and rotary-wing aircraft and are used to rapidly transport critically ill or injured patients when ground or water transport is inappropriate due to distance, obstacles, scene inaccessibility, or excessive travel time. Rotary-wing (helicopter) units are typically optimal for scene extraction and short-range transfers, while fixed-wing (airplane) services are generally used for longer-distance facility-to-facility transports and can provide advanced monitoring and critical care capability.
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