A0999 – Unlisted ambulance service
HCPCS Level II code · A codes: Transportation, Medical & Surgical Supplies, Miscellaneous & Experimental
HCPCS codeA0999
- Long description
- Unlisted ambulance service
- Short description
- Unlisted ambulance service
- Pricing indicator
57Other carrier priced- Medicare coverage
DSpecial coverage instructions apply- BETOS category
O1AAmbulance- Added
- January 1, 1987
- Last change
- January 1, 1998 – No change
Frequently asked questions
What is HCPCS code A0999?
A0999 is a HCPCS Level II code for unlisted ambulance service.
Does Medicare cover A0999?
The HCPCS file lists coverage code D: Special coverage instructions apply. Coverage and payment also depend on local coverage determinations and the patient’s plan.
Nearby A codes
- A0431 – Ambulance service, conventional air services, transport, one way (rotary wing)
- A0432 – Paramedic intercept (pi), rural area, transport furnished by a volunteer ambulance company which is prohibited by state law from billing third party payers
- A0433 – Advanced life support, level 2 (als 2)
- A0434 – Specialty care transport (sct)
- A0435 – Fixed wing air mileage, per statute mile
- A0436 – Rotary wing air mileage, per statute mile
- A0888 – Noncovered ambulance mileage, per mile (e.g., for miles traveled beyond closest appropriate facility)
- A0998 – Ambulance response and treatment, no transport
- A2001 – Innovamatrix ac, per square centimeter (add-on, list separately in addition to primary procedure)
- A2002 – Mirragen advanced wound matrix, per square centimeter (add-on, list separately in addition to primary procedure)
- A2004 – Xcellistem, 1 mg
- A2005 – Microlyte matrix, per square centimeter (add-on, list separately in addition to primary procedure)
- A2006 – Novosorb synpath dermal matrix, per square centimeter (add-on, list separately in addition to primary procedure)
- A2007 – Restrata, per square centimeter (add-on, list separately in addition to primary procedure)
- A2008 – Theragenesis, per square centimeter (add-on, list separately in addition to primary procedure)
- A2009 – Symphony, per square centimeter (add-on, list separately in addition to primary procedure)
Source: CMS HCPCS Level II quarterly file, October 2026. Reference only – check payer policy before billing.