Definition · Provider identifiers and enrollment
A Medicare opt-out is an affidavit from a physician or practitioner who chooses not to bill Medicare for two years. CMS publishes the affidavits with the NPI, specialty, state, and effective dates. This site looks up one NPI at a time in that public file. Use the Medicare opt-out lookup.
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An opt-out row is not a license action and not an exclusion. The OIG LEIE is a different file. The public opt-out extract read on October 14, 2026 had 57,780 rows. Of those, 54,300 had an end date on or after that day.
Source: CMS Opt Out Affidavits, data.cms.gov dataset 204536ee-1220-4338-b980-bfff5ce41222. Read October 14, 2026.
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