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    v1.0.30
    OpenPayerBilling CodesAmbulance and Other Transport Services and SuppliesHCPCS hcpcs-a0435-fixed-wing-air-mileage-per-statute-mile
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    HCPCS A0435: Fixed-wing Air Mileage, Per Statute Mile

    HCPCS Level II code A0435 describes fixed-wing air ambulance mileage charged per statute mile for patient transport, representing the variable component of air medical transport services; the service type is fixed-wing air ambulance transport and the typical site of service is air medical transport (aeromedical, fixed-wing aircraft).

    For related coverage guidance, see recent payer policy updates: Percutaneous Arteriovenous Fistula Creation, Dialysis Services (ESRD) Coverage and Provider Requirements, Intradialytic Parenteral Nutrition - Medical Policy.

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient scenario involves a regionally critical trauma patient located at a rural hospital following a major motor vehicle collision. The patient has multisystem injuries requiring definitive care at a Level I trauma center located several hundred statute miles away. The sending facility arranges a fixed-wing air ambulance transfer to move the patient rapidly and safely to the receiving center for operative management and higher-level critical care. The clinical workflow includes stabilization at the sending ED or ICU (airway management, hemodynamic support, splinting), activation of aeromedical transport, documentation of medical necessity for fixed-wing transfer, mileage calculation from pickup to drop-off in statute miles, completion of preflight and in-flight patient monitoring by flight crew, and delivery to the receiving trauma team for continuing care.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    99238Hospital discharge day management; 30 minutes or lessMay be used by the sending facility when documenting discharge and medical necessity prior to transfer.
    99291Critical care, evaluation and management of the critically ill or injured patient; first 30-74 minutesUsed for critical care services provided prior to or during arrangements for fixed-wing transfer.
    31500Intubation, endotracheal, emergency procedurePerformed at the sending facility when airway control is required prior to air transport.
    92950Cardiopulmonary resuscitation (CPR)Billed if resuscitative measures occur during stabilization before or during transfer.
    99070Supplies and materials (except those normally included with the office visit)Used for additional supplies documented as part of the transport encounter.

    Related Modifiers

    7 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    23Modifier -23 (Unusual Anesthesia) is used on anesthesia service CPT codes when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia…- Use modifier -23 only on anesthesia CPT codes (00100–01999) when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia because of…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    80CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    208D00000X
    163W00000X
    133VN1401X
    364SI0800X
    225200000X
    225XR0403X
    2080A0000X
    2278S1500X

    Related Payer Policy Updates

    Specialty: Dialysis/Renal Replacement1 / 3

    10 rows

    PolicyPayerEffective Date
    Percutaneous Arteriovenous Fistula CreationAmeriHealth Caritas2026-08-01
    Dialysis Services (ESRD) Coverage and Provider RequirementsMississippi Division of Medicaid2026-08-01
    Intradialytic Parenteral Nutrition - Medical PolicyHealth-New-England2026-07-01
    Total Parenteral Nutrition and Intradialytic Parenteral NutritionCentene2026-05-01
    End Stage Renal Disease (ESRD): Renal Dialysispriority health2026-02-01
    Home Hemodialysis (HHD) Coverage Criteriasierra health and life2026-01-01
    Home Hemodialysis (HHD) — Coverage CriteriaUnitedHealthcare2026-01-01
    Dialysis services (acute and chronic hemodialysis and peritoneal dialysis)UnitedHealthcare2026-01-01
    Staff-Assisted Home HemodialysisCigna2025-11-15
    Parsabiv (etelcalcetide) Coverage for Secondary HyperparathyroidismMolina Healthcare2025-10-09

    Related Codes

    HCPCS-A0021-AMBULANCE-SERVICE-OUTSIDE-STATE-PER-MILE-TRANSPORT

    HCPCS A0021: Ambulance Service Outside State Per Mile, Transport (Medicaid Only)

    HCPCS-A0080-VOLUNTEER-NON-EMERGENCY-TRANSPORTATION-MILEAGE

    HCPCS Level II A0080: Non-Emergency Volunteer Vehicle Transport, Per Mile

    HCPCS-A0090-NON-EMERGENCY-TRANSPORTATION-MILE-PRIVATE-VEHICLE

    HCPCS A0090: Non-Emergency Transportation, Per Mile

    HCPCS-A0100-NON-EMERGENCY-TAXI-TRANSPORTATION

    HCPCS A0100: Non-Emergency Transportation, Taxi

    HCPCS-A0110-NON-EMERGENCY-BUS-TRANSPORTATION

    HCPCS Level II A0110: Non-Emergency Bus or Carrier Transportation

    HCPCS-A0120-NON-EMERGENCY-MINI-BUS-TRANSPORTATION

    HCPCS Level II A0120: Non‑Emergency Transportation by Mini‑Bus or Mountain Transport

    HCPCS-A0130-WHEELCHAIR-VAN-NON-EMERGENCY-TRANSPORTATION

    HCPCS Level II A0130: Non-Emergency Transportation, Wheelchair Van

    HCPCS-A0140-NON-EMERGENCY-AIR-TRANSPORTATION

    HCPCS Level II A0140: Non-Emergency Transportation and Air Travel

    HCPCS-A0160-NON-EMERGENCY-TRANSPORTATION-CASE-WORKER-SOCIAL-WORKER-PER-MILE

    HCPCS Level II A0160: Non-Emergency Transportation by Case Worker

    HCPCS-A0180-ANCILLARY-LODGING-NON-EMERGENCY-TRANSPORTATION

    HCPCS Level II A0180: Non-Emergency Transportation Lodging-Recipient

    Showing 1–10 of 40

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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