HCPCS Level II code A0384 denotes disposable supplies used for defibrillation during Basic Life Support (BLS) specialized service encounters and for Advanced Life Support (ALS) ambulances. This code matters nationally because defibrillation supplies are critical to prehospital cardiac care and are tracked separately from other ambulance consumables for billing and regulatory purposes. Key payers in typical coverage analyses include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical intent, typical sites of service, and the payer landscape. The publication outlines common modifiers associated with ambulance and supply billing, summarizes payer coverage considerations, and provides context on where this supply code fits within ambulance service line reporting. It also highlights practical elements for billing teams and policy analysts, including coding clarity, claims line placement, and common areas where documentation and jurisdictional scope of practice (BLS defibrillation allowances) affect use. Data not available in the input will be noted where relevant.