November 13, 2025 

Re: Request for Immediate Guidance on Rebilling of Repriced Part B Claims Submitted on or after October 1, 2025

Dear Administrator Oz and Acting Inspector General Hodgkins:

On behalf of our member medical group practices, the Medical Group Management Association (MGMA) thanks you for your longstanding leadership in supporting medical groups' ability to offer high-quality care. With Congress passing legislation to extend the expiration date of 1.0 work Geographic Practice Cost Indices (GPCI) floor to Medicare claims paid from October 1, 2025, to January 30, 2026, MGMA members are in a position of considerable uncertainty, facing potential billing disruptions and compliance risk. Similar uncertainties face their Medicare patients if services already billed are later repriced pursuant to congressional action, affecting the application of Part B deductibles and co-payments.

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