A9900 HCPCS code: Miscellaneous dme supply, accessory, and/or service component of another hcpcs code
A9900 is the HCPCS Level II code for miscellaneous dme supply, accessory, and/or service component of another hcpcs code. Its Medicare coverage code is C (Carrier judgment): Coverage is decided by the Medicare contractor (MAC) case by case. The NCCI unit limit is 1 per day on practitioner claims.
Code details
| Field | Value |
|---|---|
| Section | A codes — Transportation, medical/surgical supplies and miscellaneous |
| Coverage code | C — Carrier judgment |
| Pricing indicator | 46 — Priced by the Medicare contractor (no national fee) |
| BETOS category | D1E — Other durable medical equipment |
| Added | 2000-01-01 |
| Last action effective | 2001-01-01 |
NCCI unit limits (MUE)
| Claim type | Max units per day | Rationale |
|---|---|---|
| practitioner claims | 1 | Clinical: CMS Workgroup |
Medicare policy articles for this code
- A52503: Walkers - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
- A52504: Wheelchair Options/Accessories - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
- A52505: Wheelchair Seating - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
- A52514: Oxygen and Oxygen Equipment - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
What changed for A9900
- 2000-01-01: A9900 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 A9900?
A9900 is the HCPCS Level II code for miscellaneous dme supply, accessory, and/or service component of another hcpcs code. Short descriptor: "Supply/accessory/service".
Does Medicare cover A9900?
Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.
How many units of A9900 can be billed per day?
1 on practitioner claims (NCCI medically unlikely edits).
Related A99 codes
- A9901 — Dme delivery, set up, and/or dispensing service component of another hcpcs code
- A9999 — Miscellaneous dme supply or accessory, not otherwise specified
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Next steps
- Run a reimbursement report for a device billed under A9900
- Watch A9900 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for A9900
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.