A0420 – Ambulance waiting time (als or bls), one half (1/2) hour increments
HCPCS Level II code · A codes: Transportation, Medical & Surgical Supplies, Miscellaneous & Experimental
HCPCS codeA0420
- Long description
- Ambulance waiting time (als or bls), one half (1/2) hour increments
- Short description
- Ambulance waiting 1/2 hr
- Pricing indicator
00Not separately priced by Part B (bundled, not covered or Part A only)- Medicare coverage
INot payable by Medicare- BETOS category
O1AAmbulance- Added
- January 1, 1995
- Last change
- January 1, 2014 – No change
Frequently asked questions
What is HCPCS code A0420?
A0420 is a HCPCS Level II code for ambulance waiting time (als or bls), one half (1/2) hour increments.
Does Medicare cover A0420?
The HCPCS file lists coverage code I: Not payable by Medicare. Coverage and payment also depend on local coverage determinations and the patient’s plan.
Nearby A codes
- A0380 – Bls mileage (per mile)
- A0382 – Bls routine disposable supplies
- A0384 – Bls specialized service disposable supplies; defibrillation (used by als ambulances and bls ambulances in jurisdictions where defibrillation is permitted in bls ambulances)
- A0390 – Als mileage (per mile)
- A0392 – Als specialized service disposable supplies; defibrillation (to be used only in jurisdictions where defibrillation cannot be performed in bls ambulances)
- A0394 – Als specialized service disposable supplies; iv drug therapy
- A0396 – Als specialized service disposable supplies; esophageal intubation
- A0398 – Als routine disposable supplies
- 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)
- A0425 – Ground mileage, per statute mile
- A0426 – Ambulance service, advanced life support, non-emergency transport, level 1 (als 1)
- A0427 – Ambulance service, advanced life support, emergency transport, level 1 (als 1 - emergency)
- A0428 – Ambulance service, basic life support, non-emergency transport, (bls)
- A0429 – Ambulance service, basic life support, emergency transport (bls-emergency)
- A0430 – Ambulance service, conventional air services, transport, one way (fixed wing)
Source: CMS HCPCS Level II quarterly file, October 2026. Reference only – check payer policy before billing.