Skip to content
FonteumThe Graph
DataResearchCare CompareThe DifferAttestAPI
See the proof
  • Data
  • Research
  • Care Compare
  • The Differ
  • Attest
  • API
See the proof

Dataset family

CMS PECOS

Provider Enrollment, Chain and Ownership System — Medicare enrollment, reassignment, and ownership relationships for providers and organizations. 2.6M rows. Snapshot 2026-05-01.

Dataset spec

dataset_idcms-pecos
snapshot_date2026-05-01
sha256Computed per snapshot — see /trust/integrity
doi10.5072/fonteum.dataset.cms-pecos (reserved)
update_cadenceMonthly
licenseUS Government Works (public domain, 17 U.S.C. §105)

Studies citing CMS PECOS (6)

  • Barred but order-eligible: excluded providers still cleared to order and refer in Medicare
    2026-06-15 · 10 min
  • Most of Medicare's posted revalidation deadlines are already past due, 2026
    2026-06-15 · 9 min
  • Barred but billable: excluded providers still enrolled in Medicare
    2026-06-14 · 9 min
  • Who is enrolled in Medicare? The nurse practitioner is now the most common clinician
    2026-06-11 · 11 min
  • Provider exclusions aren't rising — but they cluster around distressed operators
    2026-05-05 · 7 min
  • A March spike in Medicare enrollment deactivations thinned provider supply in shortage areas
    2026-04-28 · 6 min
CMS PECOS API endpoint → /data/ordering-referringAll research →

Built on the authoritative federal record

The primary sources, named on every page.

These are the federal agencies whose public datasets Fonteum ingests and attributes — the issuing authorities, not customers or partners. Every figure on the site links back to one of them.

  • CMS
  • HHS-OIG
  • HRSA
  • FDA
  • NLM
  • NUCC
  • Census
  • BLS
  • BEA

See the full source registry, with license and refresh cadence for each →

Reproducible by design

Every figure traces to its federal source.

14-tuple provenance

Every rendered fact ties to a source URL, dataset ID, snapshot date, row key, and SHA-256 — the full chain-of-custody record.

Reproducible SQL

Each study ships the exact query behind its figures, run against the cited federal snapshot. Re-run it yourself.

Daily reconciliation

Published counts are reconciled against the upstream federal datasets on a daily cadence, with drift logged.

Named medical review

Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

Read the full provenance and attestation methodology →

Two doors

Use the free API and open data

Query providers, facilities, sanctions, and quality scores — each field carrying its federal source. Self-serve, no call to start.

Explore the API →Browse the data catalog →

Talk to us

Managed pilots, enterprise terms, and audit-ready, signed attestation packages for compliance, risk, and research teams.

Talk to us →
Fonteum
Products
The DifferAttestAPIFHIR API
Data
Care CompareResearchData catalogSources
Company
Why FonteumAboutPressEditorial policyCorrections
Legal
Privacy policyTerms of serviceMedical disclaimer

Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

© 2026 Fonteum LLC. All rights reserved.

The U.S. healthcare graph AI can cite — every fact carries its source.

Request access→

The substrate, by the numbers

9.2Mgraph entitiesProviders, organizations, owners, and facilities
13.4Mlinked identifiersNPIs, CCNs, LEIs and more, resolved to entities
4.7Mgraph edgesSource-attested relationships between entities
44federal source familiesDistinct CMS, OIG, HRSA, FDA and peer datasets
35dataset pagesCitable, downloadable /data catalog pages
52reproducible studiesEach shipping the SQL behind its figures