HCPCS Code A0427: ALS1- emergency

## **HCPCS code A0427 documentation requirements** When documenting HCPCS code A0427, here are some requirements to follow: ### **Physician certification statement (PCS) or equivalent documentation** In true emergencies, a PCS is not required; however, there must be sufficient documentation from EMS personnel or hospital staff describing the emergency nature of the transport. For non-emergency or repetitive transports that misuse A0427, claims will be denied unless medical records clearly justify the emergency designation. ### **Run sheet or trip report** EMS providers must maintain a detailed trip report documenting the entire call. This includes the patient’s chief complaint, vital signs, the type of interventions performed, medications administered, and any changes in condition throughout the response and transport. The report should also specify the receiving facility, the time of dispatch, arrival, and patient handover, as well as the reason the destination facility was chosen. ### **Medical necessity justification** The medical record must demonstrate that ALS-level services were required rather than basic life support (BLS). Examples of qualifying scenarios include cardiac or respiratory distress, trauma requiring intravenous support, altered mental status requiring airway management, or administration of medication during transport. The documentation should make clear that the patient’s condition justified both the emergency response and ALS-level intervention. ### **Proof of transport** To qualify for reimbursement, the documentation must confirm that the patient was actually transported to the nearest appropriate facility. The report should indicate that transport was necessary due to medical need and not for reasons of convenience or patient preference.

## **HCPCS code A0427 billing requirements** Billing for HCPCS code A0427 requires compliance with Medicare’s ambulance coverage criteria, documentation standards, and appropriate claim submission practices. This code represents one-way emergency ground ambulance transport that includes advanced life support (ALS) services provided by qualified personnel such as paramedics. ### **One-way emergency transport** One unit of A0427 represents a single, one-way transport from the point of pickup to the nearest appropriate medical facility. The claim must clearly show that the service was an emergency and that advanced life support was both dispatched and medically necessary. Round-trip or standby services cannot be billed under this code. ### **ALS base rate and mileage billing** The base rate for A0427 includes the cost of the ALS-level emergency response, patient assessment, and treatment provided during transport. However, mileage is billed separately under HCPCS code A0425 (Ground mileage, per statute mile). Only medically necessary loaded mileage—when a patient is on board—should be reported. Standby time, return trips, or non-patient transport mileage are not billable. ### **Provider enrollment and claim submission** Ambulance suppliers must be enrolled appropriately and certified with Medicare to bill for A0427. Claims must include the origin and destination modifiers (e.g., RH for residence to hospital), the number of miles traveled, and supporting documentation such as the EMS trip report and medical records. The HCPCS codes A0427 and A0425 are reported on separate claim lines. ### **Medical review and payment limits** Medicare and other payers may conduct a medical review to verify that the transport met emergency and ALS-level criteria. Claims may be denied if documentation does not clearly demonstrate medical necessity or if BLS could have safely transported the patient. Payment is made only for the loaded trip to the nearest appropriate facility. If a patient is pronounced dead before transport, only specific services (e.g., response and treatment without transport) may be billable under separate codes, such as A0428 or A0998, depending on payer policy.

## **Other relevant codes** - **A0426**: Ambulance service, advanced life support, non-emergency transport, level 1 (ALS 1) - **A0428**: Ambulance service, basic life support, non-emergency transport (BLS) - **A0429**: Ambulance service, basic life support, emergency transport (BLS-emergency) - **A0433**: Advanced life support, level 2 (ALS 2) - **A0422**: Ambulance (ALS or BLS) oxygen and oxygen supplies, life-sustaining situation - **A0424**: Extra ambulance attendant, ground (ALS or BLS) or air (fixed or rotary winged); (requires medical review) - **S0207**: Paramedic intercept, non-hospital-based ALS service (non-voluntary), non-transport - **A0430**: Ambulance service, conventional air services, transport, one way (fixed wing)