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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 →

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

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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.

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
47reproducible studiesEach shipping the SQL behind its figures

ARCHIVE

Snapshot Archive

Content-addressed snapshots of federal healthcare datasets. Each archive is SHA-256-attested, signed into an append-only chain, and independently re-derivable from its published manifest.

Source: Federal healthcare datasets·Snapshot: 2026-05-28·Method: 2026.05.28·ID: cms-nppes

Append-only chain

3Snapshots archivedContent-addressed records in the public archive.
1Links in chainSigned links from genesis to head.
44Federal source familiesDistinct upstream federal datasets.

CHAIN MANIFEST

/api/v1/chain

Head link 0.
8eb78f0071b9…
Open manifest

SIGNING KEY

Ed25519

fonteum-chain-2026-05-30.
ee:4b:9a:97:c6:04:1d:76
Published public key

GENESIS

Link 0

Signed 2026-05-30.
0000000000000000000000000000000000000000000000000000000000000000
Chain semantics

Browse the archive

Filter by dataset or capture window. Every row links to the full provenance record and a downloadable, content-addressed archive whose SHA-256 digest can be checked against the chain.

Archived snapshots with per-row SHA-256 provenance
CapturedDatasetRecordsSizeSHA-256 digestMethodSnapshot
2026-05-28
cms-nppes
—
1.03 GB
8b5267e250fd…
2026.05.28
Open
2026-02-01cms-nppes—1.03 GB8b5267e250fd…2026.05.28Open
2026-01-01cms-nppes—1.03 GB2625999a2b1b…2026.05.28Open
  1. [1]44 federal source families underlie the archived datasets; each snapshot records its upstream source and capture date.
  2. [2]Chain manifest — head pointer, total links, and published signing key.
  3. [3]Published Ed25519 signing key (JSON).
  4. [4]Chain semantics and offline re-derivation steps.