HCPCS Code A9277: Transmitter; External, for Use with Interstitial CGM System

Find out how HCPCS code A9277 applies to adjunctive continuous glucose monitors, including billing rules, documentation needs, and Medicare non-coverage.

Use Code

Frequently asked questions

Medicare reimbursement doesn't apply to A9277 because it applies to non-therapeutic (adjunctive) CGM systems, which are not classified as durable medical equipment. Medicare only covers therapeutic CGMs billed under E2103 when all coverage criteria are met.

Bill A9277 only when reporting the transmitter for a non-therapeutic CGM system that is not DME-covered. Use A4238/A4239 or E2103 for therapeutic CGM systems like Dexcom G6/G7 or FreeStyle Libre 2/3, depending on payer policy and whether supplies are bundled.

Include a Standard Written Order (SWO), detailed physician’s order with medical necessity, and proof that the device was dispensed and used as prescribed. Supporting records should specify the device model, manufacturer, serial number, and reason for replacement or continued use.