A9999 HCPCS code: Miscellaneous dme supply or accessory, not otherwise specified
A9999 is the HCPCS Level II code for miscellaneous dme supply or accessory, not otherwise specified. In 2023 Medicare paid an average of $28.56 per service for A9999 across 38 services. 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. Medicare volume rose 138% from 2022 to 2023 (16 to 38 services). In 2024, 81 suppliers billed Medicare for A9999 (purchases), serving 990 beneficiaries; Alaska, Minnesota, California accounted for 63% of services.
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 | D1F — Prosthetic and orthotic devices |
| Added | 2004-01-01 |
| Last action effective | 2004-01-01 |
Who bills A9999 (2024)
| Measure | Value |
|---|---|
| Suppliers billing rentals | — |
| Suppliers billing purchases | 81 |
| Referring clinicians | 620 |
| Medicare beneficiaries | 990 |
| States with claims | 23 |
| Share of services in top 3 states (Alaska, Minnesota, California) | 63% |
| Year | Suppliers | Beneficiaries |
|---|---|---|
| 2022 | 166 | 1,798 |
| 2023 | 108 | 866 |
| 2024 | 81 | 990 |
Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.
Medicare utilization for A9999, 2022–2023
| Year | Services | Beneficiaries | Avg. allowed | Avg. paid |
|---|---|---|---|---|
| 2022 | 16 | 16 | $12.70 | $10.13 |
| 2023 | 38 | 38 | $35.85 | $28.56 |
States with the most A9999 services (2023)
| State | Services | Avg. paid |
|---|---|---|
| Oklahoma | 26 | $36.28 |
NCCI unit limits (MUE)
| Claim type | Max units per day | Rationale |
|---|---|---|
| practitioner claims | 1 | Clinical: CMS Workgroup |
Medicare policy articles for this code
- A52458: Automatic External Defibrillators - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
- A52464: Glucose Monitor - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
- A52466: Nebulizers - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
- A52492: Tracheostomy Care Supplies - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
- A52502: Heating Pads and Heat Lamps - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
- A52507: External Infusion Pumps - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
Covered diagnoses (793 ICD-10-CM codes)
The diagnoses most often listed as covered in the policy articles above:
| ICD-10-CM | Diagnosis | Articles listing it |
|---|---|---|
| E08.00 | Diabetes mellitus due to underlying condition with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC) | 2 |
| E08.01 | Diabetes mellitus due to underlying condition with hyperosmolarity with coma | 2 |
| E08.10 | Diabetes mellitus due to underlying condition with ketoacidosis without coma | 2 |
| E08.11 | Diabetes mellitus due to underlying condition with ketoacidosis with coma | 2 |
| E08.21 | Diabetes mellitus due to underlying condition with diabetic nephropathy | 2 |
| E08.22 | Diabetes mellitus due to underlying condition with diabetic chronic kidney disease | 2 |
| E08.29 | Diabetes mellitus due to underlying condition with other diabetic kidney complication | 2 |
| E08.311 | Diabetes mellitus due to underlying condition with unspecified diabetic retinopathy with macular edema | 2 |
| E08.319 | Diabetes mellitus due to underlying condition with unspecified diabetic retinopathy without macular edema | 2 |
| E08.3211 | Diabetes mellitus due to underlying condition with mild nonproliferative diabetic retinopathy with macular edema, right eye | 2 |
Showing 10 of 793. The full list, non-covered diagnoses and CSV export are in Caduvo.
What changed for A9999
- 2004-01-01: A9999 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 A9999?
A9999 is the HCPCS Level II code for miscellaneous dme supply or accessory, not otherwise specified. Short descriptor: "Dme supply or accessory, nos".
How much does Medicare pay for A9999?
In 2023, the average Medicare payment was $28.56 per service (average allowed $35.85).
Does Medicare cover A9999?
Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.
Which diagnoses support coverage for A9999?
Medicare policy articles that cite A9999 list 793 covered ICD-10-CM diagnosis codes across 6 articles. The most cited include E08.00 (Diabetes mellitus due to underlying condition with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)), E08.01 (Diabetes mellitus due to underlying condition with hyperosmolarity with coma), E08.10 (Diabetes mellitus due to underlying condition with ketoacidosis without coma). A listed diagnosis is necessary but not sufficient; the policy's other criteria still apply.
How many units of A9999 can be billed per day?
1 on practitioner claims (NCCI medically unlikely edits).
Related A99 codes
- A9900 — Miscellaneous dme supply, accessory, and/or service component of another hcpcs code
- A9901 — Dme delivery, set up, and/or dispensing service component of another hcpcs code
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 A9999
- Watch A9999 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for A9999
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.