AI summary
The Medicare opt-out list is CMS's current Opt Out Affidavits file. Search it with an exact ten-digit NPI to see whether that identifier appears in the dated source snapshot. A returned row records an opt-out affidavit; no returned row means only that the loaded snapshot contains no matching NPI.
Each receipt below describes its exact retained artifact or live source. Dates and digests never cross artifact boundaries.
Evidence publisher: Centers for Medicare & Medicaid Services (CMS). Source date: 2026-05-15.
No captured bytes are represented; use the live publisher link to re-check this source.
Scope and material limitation
The lookup reads one dated CMS roster and accepts an exact NPI. It is not a cumulative affidavit history or a Medicare eligibility check.
Dated source facts
Source-snapshot manifest receipt
This receipt attests the source snapshot manifest, not any individual fact.
The answer-series chain record is unsigned. It does not authenticate a person, organization, eligibility state, or individual fact.
8f8d6dd162e0efe4187a1e3bd95c4254b23bda9ec8b1607ec965444e408f7452b75150fb0b67ee591c62c65435c7c6c727786f843ba92a9f588534c8bc7acff7cd81f0f0adeaee1ba7671472e4dcaede19e9d464cf305f16a859d26068e65d780unsignedPrimary-source chain
Limitation: This is a dated current-roster snapshot, not a cumulative history. A returned row records an affidavit; no row is not an eligibility or participation conclusion.
Re-derive this answer from the cited government file; no Fonteum account is required.
Methodology and limitations
Frequently asked questions
What’s on file, by the numbers
Platform snapshot · 2026-08-11
Integrated, with-data, and fresh-observation counts are separate. No platform-wide source-completeness count is published. Completeness is source-specific and must be evaluated against the named source's expected scope. State coverage is a separate jurisdiction measure.
Source authority is record-specific
Use the issuer named on the record.
Fonteum spans federal, state, and global public publishers. A source page or returned record identifies its issuer and dataset where that metadata is available. A platform registry count does not assign every page to one authority or establish loaded, fresh, or complete coverage.
Reproducible by design
Inspect the evidence each published figure actually supplies.
Source and date
Research pages expose the named public file and observation date where those fields are available. Source-file SHA-256 coverage is separate; facts do not currently link deterministically to signatures.
Available derivation
Studies with a retained release and committed derivation link the SQL or method used. Other studies state the evidence and reproduction limits they actually have.
Daily observations
Dated table row-count observations can detect local drift. They do not imply that an upstream publisher released or Fonteum ingested new data that day.
Named medical review
Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.