A0999 HCPCS code: Unlisted ambulance service
A0999 is the HCPCS Level II code for unlisted ambulance service. In 2022 Medicare paid an average of $208.40 per service for A0999 across 57 services. Its Medicare coverage code is D (Special coverage instructions apply): Medicare covers it when its national or local coverage criteria are met. The NCCI unit limit is 1 per day on outpatient hospital claims. In 2022, about 16 clinicians billed Medicare for A0999 for 57 beneficiaries.
Code details
| Field | Value |
|---|---|
| Section | A codes — Transportation, medical/surgical supplies and miscellaneous |
| Coverage code | D — Special coverage instructions apply |
| Pricing indicator | 57 |
| BETOS category | O1A — Ambulance |
| Added | 1987-01-01 |
| Last action effective | 1998-01-01 |
Who bills A0999 (2022)
| Measure | Value |
|---|---|
| Clinicians billing (by place of service) | 16 |
| Medicare beneficiaries | 57 |
| States with claims | 2 |
Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.
Medicare utilization for A0999, 2022–2022
| Year | Services | Beneficiaries | Avg. allowed | Avg. paid |
|---|---|---|---|---|
| 2022 | 57 | 57 | $263.06 | $208.40 |
States with the most A0999 services (2022)
| State | Services | Avg. paid |
|---|---|---|
| Colorado | 33 | $42.27 |
| Pennsylvania | 11 | $302.84 |
NCCI unit limits (MUE)
| Claim type | Max units per day | Rationale |
|---|---|---|
| outpatient hospital claims | 1 | Clinical: Data |
| practitioner claims | 1 | Clinical: Data |
What changed for A0999
- 1987-01-01: A0999 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 A0999?
A0999 is the HCPCS Level II code for unlisted ambulance service. Short descriptor: "Unlisted ambulance service".
How much does Medicare pay for A0999?
In 2022, the average Medicare payment was $208.40 per service (average allowed $263.06).
Does Medicare cover A0999?
Coverage code D — Special coverage instructions apply. Medicare covers it when its national or local coverage criteria are met.
How many units of A0999 can be billed per day?
1 on outpatient hospital claims; 1 on practitioner claims (NCCI medically unlikely edits).
Related A09 codes
- A0998 — Ambulance response and treatment, no transport
Building a device that would bill under a code like this? Caduvo matches a device description to HCPCS/CPT codes, Medicare coverage and payment, and the FDA pathway in one report.
Next steps
- Run a reimbursement report for a device billed under A0999
- Watch A0999 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for A0999
Sources: CMS HCPCS Level II release October 2026; 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.