Summary & Overview
HCPCS Level II A0427: Ambulance Advanced Life Support, Emergency Transport
HCPCS Level II code A0427 denotes an ambulance service categorized as Advanced Life Support, Level 1 (ALS 1) for emergency ground transports. Nationally, this code captures prehospital emergency care when paramedic-level interventions are provided en route and signals a higher-acuity transport than basic life support. Proper use of A0427 affects billing, resource allocation for emergency medical services, and alignment with payer policies for ambulance reimbursement.
Major national payers that commonly adjudicate claims for this code include Aetna, Blue Cross Blue Shield, Cigna Health, and UnitedHealthcare. Readers will find information on payer coverage patterns, documentation elements that typically support ALS 1 emergency transport claims, and distinctions between ALS 1 and related advanced life support categories. The publication also outlines common billing modifiers and coding relationships that are relevant when submitting A0427 to payers.
This summary provides a concise clinical and billing context for EMS administrators, coders, and policy analysts seeking to understand where A0427 fits within emergency medical transport coding and payer practices. Data not available in the input regarding service-line specifics and state-level policy variations is noted where applicable.
Billing Code Overview
HCPCS Level II code A0427 describes ambulance service, advanced life support, emergency transport, level 1 (ALS 1‑emergency). This code applies to ground ambulance emergency transports where advanced life support interventions are provided during the transport. The service type is Ambulance/EMS transport, and the typical site of service is ground ambulance emergency transport (Place of Service 12 – Ambulance Vehicle).
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Clinical & Coding Specifications
Clinical Context
A patient experiences a medical emergency (for example, acute chest pain, severe shortness of breath, altered mental status, or significant trauma) at home or in a public place. Emergency Medical Technician–Paramedic (EMT‑Paramedic) personnel respond, provide on-scene assessment and advanced life support interventions (airway management, intravenous access, cardiac monitoring, medication administration), and determine that ground emergency transport to an appropriate receiving facility is required. The patient is transported in a ground ambulance (Place of Service 12 – Ambulance Vehicle) with continuous ALS level 1 care documented during transport. Billing uses HCPCS Level II code A0427 for the ambulance service classified as advanced life support, emergency, level 1.
Coding Specifications
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Modifiers
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QM: Ambulance service provided under arrangement by a provider of services. Use when the transporting ambulance service is furnished under arrangement (contracted) by a hospital or other provider of services. -
QN: Ambulance service furnished directly by a provider of services. Use when the transporting ambulance service is furnished directly by the hospital or provider of services billing the claim. -
Provider taxonomies and specialties
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252E00000X: Emergency Medical Technician–Paramedic (EMT‑Paramedic). Represents prehospital providers trained and credentialed to deliver advanced life support interventions during emergency ambulance transport. -
If additional modifiers or taxonomies are required by a payer, those are not provided in the input.
Related Diagnoses
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Related Codes
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A0433: Advanced life support, level 2 (ALS 2). -
Relationship to
A0427:A0433represents a higher intensity advanced life support transport (ALS level 2) compared withA0427(ALS level 1). In clinical workflow,A0427is billed when ALS level 1 emergency interventions are provided during ground transport;A0433is billed when ALS level 2 interventions or circumstances meet payer-defined criteria. These codes may be used as alternatives depending on the level of ALS care documented during the same transport.
National Reimbursement Benchmarks
National mean rates for HCPCS Level II code A0427 show that the BUCA commercial average ($423.75) sits between Medicare and the highest commercial payers; Medicare is listed as $0.00 in the input while BUCA’s mean of $423.75 is lower than UnitedHealthcare ($529.56) and Blue Cross Blue Shield ($524.41) but higher than Aetna ($295.49) and Cigna Health ($297.87). The table and chart below present the full breakdown by payer.
Rate dispersion (P75 minus P25) varies notably across payers: Blue Cross Blue Shield exhibits the widest spread ($351.00), UnitedHealthcare shows a wide spread ($125.00), BUCA has a moderate spread ($176.00), Aetna’s spread is narrow ($48.00), and Cigna Health is the tightest with no dispersion ($0.00). The table and chart below present the full breakdown by payer.
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