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.
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.
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.
Talk to us
Managed pilots, enterprise terms, and audit-ready, signed attestation packages for compliance, risk, and research teams.
The substrate, by the numbers
NPPES uses NPIs. PECOS uses PECOS-IDs. CMS Care Compare uses CCNs. OIG LEIE uses NPIs and legacy LEIE-IDs. HRSA HPSA uses Provider-IDs. Fonteum resolves them into one canonical identity per provider across all 5 identity-graph datasets, with confidence-banded matching + per-link methodology version + source evidence sufficient to manually audit every link decision.
0providers canonically linked across 5 identity-graph datasets·0high-confidence links·methodology —·last extended —
Verifier reference + code samples → Cryptographic chain → Snapshot integrity →
No identity links yet. The linker runs every 5 minutes against the NPPES specialty caches + 4 source-side tables (pecos_providers, carecompare_providers, leie_providers, hrsa_providers). All 4 source tables ship empty; once Cowork backfills normalize source_snapshots payloads into them, the linker will begin producing links and this chart will populate.
NPPES ↔ PECOS
exact_npi_in_pecos · confidence 1.0npi matching an NPPES record. Strongest possible link.exact_name_address · confidence 0.95name_address_fuzzy · confidence 0.7-0.9NPPES ↔ Care Compare CCN
exact_npi_in_carecompare · confidence 1.0exact_name_address_carecompare · confidence 0.95NPPES ↔ OIG LEIE
# Resolve an NPI to its canonical PECOS-ID
curl https://fonteum.com/api/v1/identity/nppes/1245319599
# Resolve a PECOS-ID to its canonical NPI
curl https://fonteum.com/api/v1/identity/pecos/PAC-100001
# Aggregate stats: total linked + confidence-band distribution
curl https://fonteum.com/api/v1/identity/stats
# Opt-in to surface low-confidence (<0.9) links for diligence
curl 'https://fonteum.com/api/v1/identity/nppes/1245319599?include_low_confidence=true'Full reference + Node + Python + Go samples at /docs/identity.
Once a canonical identity layer exists and is queryable, it becomes the default reference for the category. Every Fonteum consumer (MCP server, webhook events, semantic search, future dbt package) joins against provider_identity_links, not against the federal sources directly.
exact_npi_in_leie · confidence 1.0name_dob_leie · confidence 0.95NPPES ↔ HRSA HPSA
exact_npi_in_hrsa · confidence 1.0Operator-asserted
manual · confidence 1.0