HCPCS Code A9900: Miscellaneous DME Supply and Accessory

Learn about HCPCS code A9900, which covers miscellaneous DME supplies, accessories, or service components not described by another HCPCS code.

Use Code

Frequently asked questions

Use A9900 only when billing for a DME accessory, supply, or service component that does not have a more specific HCPCS code and is part of another coded item. The documentation must clearly describe the item, link it to the primary DME, and explain why an existing code does not apply. Always confirm that the payer allows separate billing for miscellaneous components.

Yes. Medicare and most payers frequently deny A9900 claims using CARC 97 (service included in another service/procedure) when the accessory is considered bundled with the primary DME code. To reduce denials, confirm whether the item is separately payable and provide detailed justification and item descriptions on the claim.

Yes. Requirements vary by payer. For example, Medi-Cal classifies A9900 as a “by-report” item and requires documentation in Box 19 or as attachments, including the manufacturer, model number, MSRP, itemization, and clinical justification. Always check your payer’s DME billing manual or coverage policy before submission.