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Developer

Build on Fonteum’s healthcare data

Fonteum publishes federal healthcare provider data with 14-tuple chain-of-custody provenance. Access it via FHIR R4 API, bulk dataset downloads, or provider event webhooks. All data derives from primary CMS, OIG, and HRSA sources — free, no paywall.

Reviewed by Dr. Jennifer Montecillo, MD, non-practicing medical reviewer. Last reviewed: June 2026 · Next review: December 2026

FHIR API

HL7 FHIR R4 US Core 6.1.0 provider directory. Practitioner, Organization, Location, PractitionerRole, HealthcareService — with SMART Backend Services auth and Bulk Data $export.

Read the reference→

Datasets

Bulk dataset downloads for all ingested federal source families — NPPES, CMS Care Compare, OIG LEIE, HCRIS, QPP MIPS, and more. NDJSON and CSV formats.

Browse datasets→

Webhooks

Subscribe to provenance-stamped provider events. Receive HMAC-SHA256-signed POST notifications when LEIE or PECOS state changes for a tracked provider.

Register a subscriber→

What you can build

Integration patterns

  • EHR and clinical workflow integrations — pull practitioner directory data into scheduling, referral, and credentialing modules using the FHIR PractitionerRole resource.
  • Compliance dashboards — surface OIG LEIE exclusion status and PECOS enrollment state for providers in your network using the webhook stream.
  • Research pipelines — download full NDJSON snapshots of NPPES, Care Compare, and QPP MIPS datasets for longitudinal cohort studies and quality analyses.
  • Quality-scoring applications — combine MIPS performance scores, Care Compare star ratings, and HCRIS cost data to build custom provider quality indices.

Developer FAQ

Common questions

What developer APIs does Fonteum offer?
Fonteum provides three developer access paths: an HL7 FHIR R4 provider directory API (Practitioner, Organization, Location, PractitionerRole, HealthcareService resources), bulk dataset downloads in NDJSON and CSV formats for all ingested federal source families, and HMAC-SHA256-signed provider event webhooks that fire when LEIE or PECOS state changes for a tracked provider.
Is authentication required to use the Fonteum FHIR API?
Anonymous GET requests are permitted for individual resource reads. SMART Backend Services authentication (client credentials flow with a signed JWT) is required for the Bulk Data $export operation, which streams the full provider dataset as NDJSON. Registration is free.
What federal data sources power the Fonteum API?
The Fonteum API draws from 12+ federal source families including NPPES, CMS PECOS PPEF, OIG LEIE, CMS Care Compare (Nursing Home, Home Health, Hospice, Dialysis, ASC), HCRIS Hospital Cost Reports, CMS QPP MIPS, HRSA HPSA, and HRSA UDS. Every field carries 14-tuple chain-of-custody provenance tracing back to the originating federal record.
How does Fonteum's 14-tuple provenance chain work?
Each data field is tagged with 14 provenance fields: dataset ID, source agency, source URL, archive URL, snapshot date, reporting period, methodology version, entity type, entity ID, field name, field value, confidence tier, chain link hash, and attested-at timestamp. This chain links every rendered fact to the specific federal record row it originated from and the ingestion run that imported it.
Where can I find the FHIR CapabilityStatement?
The FHIR CapabilityStatement is published at /api/fhir/metadata. It enumerates 5 USCDI v3 Provider resources: Practitioner, Organization, Location, PractitionerRole, and HealthcareService. The statement conforms to US Core 6.1.0 and includes SMART Backend Services security extensions.

Related documentation

  • /docs/fhir— FHIR R4 provider directory API reference
  • /docs/bulk-export— Bulk Data $export implementation guide
  • /docs/identity— Federated identity resolution (NPI ↔ PECOS-ID)
  • /docs/webhooks— Provider event webhook subscription
  • /for/developers— Fonteum for developers — use cases and access

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 →
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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.

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The substrate, by the numbers

9.2Mgraph entitiesProviders, organizations, owners, and facilities
12.5Mlinked 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
33dataset pagesCitable, downloadable /data catalog pages
48reproducible studiesEach shipping the SQL behind its figures