Original Medicare provider redetermination deadline

For billing teams checking the first appeal after an actual claim determination.

Provider/physician/supplier party to an initial Original Medicare claim determination. Not Medicare Advantage, a PA non-affirmation, minor-error reopening or higher-level appeal. Separate overpayment/recoupment protections and deadlines are not determined by this filing-window record.

Source verification required. Deadline and filing instructions are withheld pending a current source check.

CMS official source: Requesting a Redetermination · checked 2026-10-19

Current guidance, not a reconstructed effective-date history.

MAC dismissed the request? Compare dismissal review and vacatur.

For a decision already reviewed at level one, check the separate QIC reconsideration filing window · Prepare, save and export a provider redetermination checklist · Find scoped contractor mailing addresses · PA non-affirmation before a claim? Use the separate RSNAT correction workflow