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The U.S. healthcare graph

The audit-defensible source of truth for U.S. healthcare.

Fonteum turns the government's scattered, hard-to-trust healthcare data into one source-cited record — every fact traced to one of 44 federal source families — so AI agents and software teams can use it without guessing.

Explore the API →See the proof

Need a managed pilot or enterprise terms? Request access →

Resolve a provider

Found ✓
✓Record resolved · attested2026-05
Name
Specialists in Dermatology PLLC
CMS NPPES · 2026-05
NPI
1073662946
CMS NPPES · 2026-05
Specialty
Dermatology
CMS NPPES · 2026-05
Location
Tucson, AZ
CMS NPPES · 2026-05
Status
Active (NPI registry)
CMS NPPES · 2026-05
Exclusions
None on record
OIG LEIE · 2026-05
See the proof in the DifferOpen this record in the APICheck the signed chain
SOURCE FAMILIES  |  CMS · OIG · HRSA · BLS · Census · BEA44 source families →

Resolved, not scraped

One identity stitched across 44 federal source families — deduped, not a pile of rows.

Cited field by field

Every value carries its federal source, release date, and redistribution basis.

Signed & re-derivable

SHA-256 + Ed25519 chain on every record — verify it against the source yourself.

How it worksThe DifferLive dataAttestWhy it's defensibleSee the proof →

How it works

Three steps from query to citable record.

01

Search an entity

Look up any NPI, CCN, or provider name. The Graph resolves the entity across every federal source.

02

Get the resolved record

Every field shows which source it came from — NPPES, PECOS, OIG LEIE, Care Compare. No black box.

03

See the proof or cite it

Each record carries a SHA-256 hash and a signed attestation chain. Re-derive it yourself or cite it directly.

The Differ

The data is open. The chain is auditable.

The Differ places our resolved record beside the raw NPPES entry — field by field, source by source. Every discrepancy is visible.

Open the Differ →Verify a claim
Raw NPPES· npidata.csv
provider_last_name_org
SPECIALISTS IN DERMATOLOGY PLLC
npi
1073662946
healthcare_provider_taxonomy_code_1
207N00000X
provider_business_mailing_address_city_name
TUCSON
entity_type_code
2
Fonteum resolved✓ reconciled
Name
Specialists In Dermatology PLLC
CMS NPPES · 2026-05
NPI
1073662946
CMS NPPES · 2026-05
Specialty
Dermatology
CMS NPPES · 2026-05
City
Tucson, AZ
CMS NPPES · 2026-05
Entity type
Organization
CMS NPPES · 2026-05

NPI 1073662946 · CMS NPPES · 2026-05 · public record

Live data

44 federal source families. All public record. All cited.

Every dataset carries its source, release date, and a freshness cadence — re-published with field-level provenance, ready for your agent.

Browse the catalog →
SourceRowsUpdatedStatus
CMS NPPES
Individual + organization providers
8.3M2026-05live
CMS PECOS
Medicare enrollment records
2.98M2026-04live
OIG LEIE
Exclusion sanctions list
68,0552026-05live
CMS Care Compare
Facility quality data
15,9352026-04live
HRSA HPSA
Health professional shortage areas
8,8472026-03live
5 of 44 source families shown · all public federal dataFull registry →

Attest

Every claim has a chain.

Paste any claim ID and watch the full signed chain — from the federal source file to the Ed25519 signature. Re-derive the hash yourself; nothing changed.

Verify a claim →
Attestation chain · illustrative exampleTry it →
Entitya3f7c2e1…
NPI + name + taxonomy resolved
Snapshot8b4d9f3a…
CMS NPPES · 2026-05-01 export
Field hashc1e5a72f…
SHA-256 of normalized name field
Attestation · signed ✓f9d3b846…
Ed25519 signed · verifiable
Illustrative chain — paste a real claim ID at /proof/attestation to verify

Why it's defensible

Built on a resolved, bitemporal, signed graph.

Entity resolution

One identity across NPPES, PECOS, CCN, and Care Compare — not duplicate rows.

Bitemporal history

Every value carries what was true and when we knew it — recall any record as of any past date.

Per-cell provenance

Source on every number, not the page. Each cell ties to its federal file and release.

Open & citable

Public and AI-native by design — the source AI cites, which a paywalled competitor structurally can't be.

Start here

The federal healthcare record, ready to cite.

Explore the API →See the proof

Or request access to a managed pilot →

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.

Request access→

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