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What is Medicare provider enrollment?

Medicare provider enrollment is the process by which providers and suppliers apply for and maintain participation in Medicare so they can bill for covered services. CMS manages it through PECOS: providers file CMS-855 applications to enroll, revalidate, or update records, and receive a PTAN from their Medicare Administrative Contractor. CMS can deny or revoke enrollment for cause.

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Full name: Medicare Provider Enrollment

Short explanation

Provider enrollment is the process by which health care providers and suppliers apply for and maintain participation in Medicare, Medicaid, or other federal health care programs. CMS manages Medicare enrollment through PECOS. Providers submit CMS-855 forms (or online equivalents) to apply, revalidate, or update enrollment records. Enrolled providers receive a PTAN from their Medicare Administrative Contractor. CMS may revoke, deny, or bar enrollment for fraud, OIG exclusion, or failure to meet program standards.

Last updated: 2026-07-11Reviewed by: Dr. Jennifer Montecillo, MDGullas College of Medicine, 2019. Non-practicing medical reviewer.

How it’s used

  • CMS PECOS Medicare Provider Enrollment: PECOS is the CMS system for all Medicare provider enrollment actions — applications, revalidations, changes, and revocations.
  • OIG LEIE (oig-leie): OIG exclusions trigger mandatory revocation of Medicare enrollment — cross-referencing LEIE against PECOS records is a compliance requirement.

Frequently asked questions

What is Medicare provider enrollment?
Provider enrollment is the process of applying to CMS to participate in Medicare and receive Medicare reimbursement for covered services.
How do providers enroll in Medicare?
Providers submit CMS-855 enrollment applications through PECOS (online) or by paper form to their Medicare Administrative Contractor (MAC).
What happens if a provider fails to revalidate enrollment?
CMS may revoke Medicare billing privileges if a provider misses a revalidation deadline. Providers typically have a 90-day window to reactivate.

What’s on file, by the numbers

Platform snapshot · 2026-08-12

13.4Mproviders & companiesProviders, organizations, owners, and facilities on file
26.2Msource-linked factsSource-linked field facts in the dated platform snapshot
90sources with dataDistinct snapshot source IDs with at least one positive record count
73fresh sourcesDistinct source IDs whose latest positive-data snapshot falls within the preceding 45 days
111sources integratedActive registry rows; integration does not establish a load
13state Medicaid jurisdictionsDistinct states represented in the state-exclusions serving table

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.

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Reproducible by design

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Source and date

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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.

Read the full provenance and attestation methodology →

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