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
Every dated snapshot Fonteum publishes is SHA-256 hashed and attested at write time. Re-fetch the upstream source archive, run shasum -a 256, and compare to the hash on file at /verify/[snapshot_id]. A 64-character match means the bytes you read are byte-exact to what we ingested.
100 attestations on file across 12 source families. Foundation layer for the Certificate-Transparency-style attestation chain — hashes ship first, chain semantics layer on top once 30+ snapshots have accumulated.
snapshot_attestations. Verify any snapshot at /verify/[id].100 attestations on file across 12 source families.
cms_care_compare_nh 12 attestations1afa7971…dd4765b4attestation →Live FHIR R4 API, a public SHA-256 attestation chain, and an open methodology — every Fonteum value is traceable to its federal source. The hashes above are how a verifier proves it.
cms_pos_facilities 12 attestationscms_qpp_mips_individual 12 attestationscms-inpatient-utilization 6 attestationscms-ncci-mue-edits 1 attestationcms-ncci-ptp-edits 1 attestationcms-outpatient-utilization 5 attestationscms-provider-utilization 5 attestationsnppes 11 attestationsoig_leie 11 attestationspecos_ppef 12 attestationssource_manifest 12 attestations