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FonteumThe Graph

The capability layer

APIREST + bulk accessMCP serverCallable by AI agentsFHIR R4 APIBulk exportAttestation & audit packReconciliationSource-vs-source diffsEntity graphSnapshotsPoint-in-time, bitemporal

By use case

Exclusion & sanctions screeningCredentialing & provider-data enrichmentAudit evidence & defensible programsProvider data for AI / RAGM&A & network diligence

By buyer

Compliance & riskDevelopers & AI teams

The differentiator

Coverage & sourcesThe catalogFreshnessMethodologyCare CompareFacility qualityBrowse all datasets →
Research

The dev on-ramp

DocsAPI referenceMCPQuickstartStatusChangelogSDKs & integrations
Pricing
Sign inTry the FHIR sandbox →Request access →

Platform

APIMCP serverFHIR R4 APIBulk exportAttestation & audit packReconciliationEntity graphSnapshots

Solutions

Exclusion & sanctions screeningCredentialing & provider-data enrichmentAudit evidence & defensible programsProvider data for AI / RAGM&A & network diligenceCompliance & riskDevelopers & AI teams

Data

Coverage & sourcesFreshnessMethodologyCare CompareBrowse all datasets →
Research

Developers

DocsAPI referenceMCPQuickstartStatusChangelogSDKs & integrations
Pricing
Sign inTry the FHIR sandbox →Request access →

Provider directory

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.
48registered sourcesSources with a detail page on /sources.
35dataset 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

9.2Mgraph entitiesProviders, organizations, owners, and facilities
15.7Mlinked identifiersNPIs, CCNs, LEIs and more, resolved to entities
5Mgraph edgesSource-attested relationships between entities
44federal source familiesDistinct CMS, OIG, HRSA, FDA and peer datasets
35dataset pagesCitable, downloadable /data catalog pages
65reproducible 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
Platform
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Data & sources
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Developers
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Research
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Trust & legal
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Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

© 2026 Fonteum LLC. All rights reserved.

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

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