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

Provider directory

provider records

Every record traces to a federal source.

Search by NPI, specialty, or state. Each field carries its source name, snapshot date, methodology version, and limitation. No pay-to-rank. No editorial curation of who appears.

Look up an NPI →
44federal source familiesPublic-record families powering the provider graph.
47registered sourcesSources with a detail page on /sources.
33dataset pagesLive at /data with schema + download.
Look up a provider

Find a provider by NPI.

Enter a 10-digit National Provider Identifier to see CMS NPPES enrollment data, MIPS quality scores, and OIG exclusion status — each field shown with its source and date.

NPI lookup tool →
Browse the directory

Browse providers by specialty or state.

  • Specialty index

    By specialty

    Every NPPES taxonomy specialty, from allergy & immunology to wound care — each with its own source-provenanced hub.

    Browse specialties →

  • State index

    By state

    All 50 states and the District of Columbia, drawn from the national provider registry.

    Browse states →
Top specialties
dermatologypsychiatrycardiologyobgynpediatricsneurologyoncologyorthopedic surgeryophthalmologygastroenterologyurologyotolaryngologyplastic surgerypulmonologyendocrinologyrheumatologynephrologyinfectious diseasegeriatricschiropractic
Top states
californiatexasfloridanew yorkpennsylvaniaillinoisohiogeorgianorth carolinamichigannew jerseyvirginiawashingtonarizonamassachusettstennesseeindianamissourimarylandwisconsin
Data infrastructure

How the provider graph is built.

  • /data → Dataset catalog with schema and downloads.
  • /sources → The source registry: tier, refresh cadence, limitations.
  • /methodology → Network-wide sourcing and corrections policy.
  • /chain → Snapshot integrity and witness co-signatures.

Snapshot: 2026-05-25 · Source: CMS NPPES weekly full-replacement file · source registry

The substrate, by the numbers

44federal source familiesDistinct CMS, OIG, HRSA, FDA and peer datasets
33dataset pagesCitable, downloadable /data catalog pages
47reproducible studiesEach shipping the SQL behind its figures

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→