HCPCS Code A9999: Miscellaneous DME Supply or Accessory, Not Otherwise Specified

Guidance for billing HCPCS code A9999, documenting DME supplies/accessories, and meeting Medicare Part B coding and documentation rules.

Use Code

Frequently asked questions

Use A9999 only when no specific HCPCS code accurately describes the DME supply or accessory. The Medicare Part B final rule and CMS guidelines emphasize correct coding, meaning providers must first confirm that no listed DME code fits the item. Documentation should clearly explain medical necessity and why the item cannot be classified under another HCPCS category (e.g., unique configuration, new device, or unlisted material).

Yes. CMS and payer guidelines require including descriptive text in the claim (e.g., product name, function, and reason it is “not otherwise specified”). For adjunctive CGM or insulin pump accessories, claims must include the term “adjunctive” (in the NTE segment or Item 19 on paper forms) to ensure proper claim access and processing under Medicare Part B.

No. Under the Final Rule, reimbursement is determined by local Medicare Administrative Contractors (MACs) or commercial payer fee schedules. Payment varies by claims data, contract terms, and location. While reported averages may range around $1,000 or higher, Medicare Part B payment is not standardized—providers must confirm coverage and pricing directly with each payer.