Summary & Overview
HCPCS Level II A0433: Ambulance ALS2 All-Inclusive Emergency Ground Transport
HCPCS Level II code A0433 designates an all-inclusive advanced life support level 2 (ALS2) ambulance transport for emergency ground services. Nationally, this code captures higher-acuity pre-hospital care where advanced interventions and associated supplies and mileage are bundled into a single service line, making it a key code for emergency medical services billing and coverage determinations. The code is relevant to payers, EMS agencies, and hospital transport planners because it defines when ALS2 resources and bundled reimbursement apply.
This publication covers major commercial payers including Aetna, Blue Cross Blue Shield, Cigna Health, and UnitedHealthcare. Readers will find a concise explanation of the clinical and service context for A0433, comparisons to related ambulance codes, and the common billing considerations that affect claims processing and payer adjudication. Content highlights include clinical scenarios that typically justify ALS2 transport, the distinction between all-inclusive and mileage-separate billing, and how A0433 fits within ambulance service coding frameworks. Data not available in the input for specific payer rates or service-line revenue benchmarks is noted where applicable. The goal is to provide a clear, policy-focused reference for stakeholders handling emergency ground transport billing using HCPCS Level II code A0433.
Billing Code Overview
HCPCS Level II code A0433 represents ambulance service, advanced life support, level 2 (ALS2), all inclusive (mileage and supplies). This code describes an emergency ground transport service that includes advanced life support interventions beyond basic care, with supplies and mileage bundled into the single all-inclusive unit price. The service type is Ambulance/Transport Services, and the typical site of service is an emergency ground transport (ambulance service).
Clinical & Coding Specifications
Clinical Context
A typical scenario involves an emergency ground transport for a patient with a serious acute condition requiring advanced life support interventions. For example, emergency medical services are dispatched to a scene for a patient with severe chest pain and abnormal cardiac rhythm. On scene, paramedics provide advanced airway management, intravenous access, administration of cardiac medications, and continuous cardiac monitoring. The patient is transported by ambulance to the nearest appropriate emergency department with ALS-level care documented in the patient care report. The clinical workflow includes 911 dispatch, on-scene assessment and ALS interventions, continuous monitoring and medication administration during transport, handoff to the emergency department team, and completion of transport and billing documentation indicating ALS2 services rendered.
Coding Specifications
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HCPCS Level II code
A0433: Ambulance service, advanced life support, level 2 (ALS2), all inclusive (mileage and supplies). -
Modifiers:
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QM- Ambulance service provided under arrangement by a provider of services -
QN- Ambulance service furnished directly by a provider of services -
Provider Taxonomies:
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146L00000X- Ambulance: Represents ambulance service providers and emergency medical transport organizations -
146M00000X- Military/U.S. Coast Guard Transport: Represents military or U.S. Coast Guard transport services -
146N00000X- Air Transport: Represents air transport specialties (included as an associated taxonomy thoughA0433is for ground ALS2)
Related Diagnoses
ICD‑9 code examples converted to ICD‑10‑CM equivalents per CMS medical conditions list- Examples include severe abdominal pain, abnormal cardiac rhythm, abnormal vital signs, allergic reaction, chest pain, altered level of consciousness, seizures, choking episode, cold exposure, etc.; specific ICD‑10‑CM codes not explicitly listed.
Clinical relevance:
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These listed condition examples represent acute medical emergencies that commonly trigger advanced life support (ALS2) interventions during ambulance transport.
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Each example (severe abdominal pain, abnormal cardiac rhythm, abnormal vital signs, allergic reaction, chest pain, altered level of consciousness, seizures, choking episode, cold exposure, etc.) supports medical necessity for ALS-level ground transport when documented in the patient record and aligns clinically with services billed under HCPCS Level II code
A0433.
Related Codes
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A0427- Ambulance service, ALS, emergency transport, specialized ALS services rendered, supplies included, mileage separately billed -
A0434- Ambulance service, specialty care transport (SCT), supplies included, mileage separately billed
Relationship to A0433:
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A0427is a related ALS-level ambulance code where specialized ALS services are identified and mileage is billed separately; it may be used in workflows when specialized ALS interventions are provided and mileage is itemized rather than included. -
A0434is a higher-acuity transport code for specialty care transport and is an alternative when continuous specialty-level care is required during transport; it may be selected instead ofA0433when SCT-level resources are used.
Common use patterns:
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A0433is used when ALS2 care is provided and supplies and mileage are included in the all-inclusive rate. -
A0427orA0434may be used instead ofA0433depending on whether specialized ALS services or specialty care transport are furnished and whether mileage is billed separately.
National Reimbursement Benchmarks
National mean commercial reimbursement averages cluster above the BUCA (average commercial) mean of $675.25 for some large payers: Blue Cross Blue Shield and UnitedHealthcare both report mean rates around $763, while Aetna is lower at $640.74 and Cigna Health is substantially lower at $472.17. Medicare is not provided in the input and therefore is not included in the numeric comparison.
Dispersion (P75 − P25) varies notably by payer. Blue Cross Blue Shield shows one of the widest spreads (906 − 582 = $324), indicating greater variability; UnitedHealthcare and BUCA show moderate spreads (UHC: 766 − 586 = $180; BUCA: 736 − 540.67 ≈ $195.33). Aetna's spread is narrower (689 − 573 = $116) and Cigna Health is the tightest with no dispersion (414 − 414 = $0). The table and chart below present the full numeric breakdown of national mean rates and percentiles.
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.