A0021 HCPCS code: Ambulance service, outside state per mile, transport (medicaid only)
A0021 is the HCPCS Level II code for ambulance service, outside state per mile, transport (medicaid only). Its Medicare coverage code is I (Not payable by Medicare): Medicare does not pay separately under this code; another code applies.
Code details
| Field | Value |
|---|---|
| Section | A codes — Transportation, medical/surgical supplies and miscellaneous |
| Coverage code | I — Not payable by Medicare |
| Pricing indicator | 00 — Not separately priced by Medicare |
| BETOS category | O1A — Ambulance |
| Added | 1985-01-01 |
| Last action effective | 1996-09-10 |
What changed for A0021
- 1985-01-01: A0021 added to HCPCS Level II
- Next scheduled CMS quarterly update (HCPCS and DMEPOS fee schedule): 2027-01-01
Frequently asked questions
What is HCPCS code A0021?
A0021 is the HCPCS Level II code for ambulance service, outside state per mile, transport (medicaid only). Short descriptor: "Outside state ambulance serv".
Does Medicare cover A0021?
Coverage code I — Not payable by Medicare. Medicare does not pay separately under this code; another code applies.
Related A00 codes
- A0080 — Non-emergency transportation, per mile - vehicle provided by volunteer (individual or organization), with no vested interest
- A0090 — Non-emergency transportation, per mile - vehicle provided by individual (family member, self, neighbor) with vested interest
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Next steps
- Run a reimbursement report for a device billed under A0021
- Watch A0021 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for A0021
Sources: CMS HCPCS Level II release October 2025; CMS DMEPOS fee schedule; CMS NCCI MUE tables; CMS Medicare utilization (physician and DME supplier files); CMS Medicare Coverage Database articles. Fees are Medicare allowables, not commercial rates. Not billing or legal advice.