CurrentCentenePolicy CP.MP.175

Air Ambulance

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.

Policy Summary

PayerCentene

PolicyAir Ambulance

Policy CodePolicy CP.MP.175

Change TypeMaterial revisions and clarifications

Effective Date

Next Review Date

Key ActionObtain and document prior authorization with clinical documentation demonstrating medical necessity (clinical instability, pickup inaccessibility, or transferring facility lacks required services).

SourceLink

POLICY UPDATE CHANGES

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.

2air ambulance categories

30-60 mintravel time threshold

6HCPCS codes referenced

550k+annual utilizations (US)

Policy Summary

PayerCentene

PolicyAir Ambulance

Policy CodePolicy CP.MP.175

Change TypeMaterial revisions and clarifications

Effective Date

Next Review Date

SourceLink

On This Page

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Coverage Criteria

Medically necessary criteria

Covered when ALL of the following are met

Overall medical necessity: Air ambulance (fixed wing or rotary wing) transportation is medically necessary when ALL of criteria A, B, and C are met.

Policy I.

Criterion A - Clinical necessity: Transport by either basic or advanced life support ground ambulance would endanger the health or threaten survival of the member/enrollee.

Includes but not limited to examples listed in A.1–A.7

Examples for Criterion A: 1. Intracranial bleeding requiring neurosurgical intervention; 2. Cardiogenic shock; 3. Burns requiring treatment in a burn center; 4. Conditions requiring treatment in a hyperbaric oxygen unit; 5. Multiple severe injuries; 6. Life-threatening trauma; 7. Cerebrovascular infarction with the need for tissue plasminogen activator (tPA) at a certified stroke center.

Policy I.A

Criterion B - Location/accessibility: The point of pickup is inaccessible by ground or water ambulance, OR great distances or other obstacles (including traffic) or travel time exceeding 30 to 60 minutes are involved in getting the patient via ground transportation to the nearest hospital with appropriate facilities.30-60 minutes

Policy I.B.1–I.B.2

Criterion C - Facility capability for transfers: For facility-to-facility transports, the transferring facility does not have the appropriate services or physician specialists required to provide necessary medical care (e.g., trauma unit, burn unit, cardiac care unit, or pediatric specialty services).

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

Referenced HCPCS CodesHCPCS

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)

Ground transport travel time threshold

Ground transport travel time threshold30 to 60 minutes

Context for thresholdApplies when great distances, obstacles, including traffic, or travel time exceeding 30 to 60 minutes to the nearest appropriate facility are involved

Use in location/accessibility criterionOne of the B. location criteria that can justify air ambulance when ground/water transport would be too slow or obstructed

Provider Actions and Documentation

Prior Authorization

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

Documentation Required

Definitions

Types of air ambulance

Fixed wing (FW)Airplane used primarily for long-distance facility-to-facility transport; provides advanced monitoring and critical care capabilities; typically faster with ranges over 500 miles

Rotary wing (RW)Helicopter ideal for scene extraction and short-range transfers; can land close to incident scenes but has relatively short range due to fuel capacity

When to use each typeRW for scene transport and short-range emergent transfers; FW for long-distance facility-to-facility transports or when ground/water transport is inappropriate

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.

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

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)

Billing Rule

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