HCPCS Code A4239: Supply Allowance for Non-Adjunctive, Non-Implanted Continuous Glucose Monitor (CGM)

Learn about HCPCS Code A4239, the monthly supply allowance for non-adjunctive continuous glucose monitors, covering CGM sensors and related items.

Use Code

Frequently asked questions

Yes. The allowance covers CGM sensors and all required supplies necessary for the functioning of approved non-adjunctive CGM systems.

Supplies for devices within the Freestyle Libre portfolio fall under A4239. Providers should follow payer rules and apply the appropriate Libre portfolio billing codes to ensure correct claims processing.

In some cases, related BGM testing supplies may be used as a backup or when readings need confirmation, particularly if a patient has experience with older or adjunctive CGM devices. Documentation should note why they are needed and apply correct Freestyle Libre portfolio billing practices if relevant.