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 count checks
Published counts are checked 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 54 source families. Foundation layer for the Certificate-Transparency-style attestation chain — hashes ship first, chain semantics layer on top once 30+ snapshots have accumulated.
The chain is immutable: a signed snapshot is never edited, deleted, or re-signed. A correction is a separate appended record that references the affected snapshots and is itself Ed25519-signed by the same chain key. The wrong value stays on the record verbatim; the correction explains it. Full machine-readable list: /api/v1/chain/corrections.
snapshot-zero-count-nppes-pecos-2026-06-19·nppes pecos_ppef·2026-05-31 → 2026-06-18·38 snapshotsRecorded value: 0 Correction: indeterminate for the affected window — the snapshotter never counted the real table, so the true historical row count for these dates is unknown and is NOT reconstructed here. The dataset was non-empty throughout (current nppes_providers ≈ 9.0M rows, pecos_providers ≈ 2.98M rows); the recorded 0 was a table-mapping defect, not a real measurement of an empty dataset.
The daily-dataset-snapshotter mapped source_id `nppes` to a non-existent `providers` table and `pecos_ppef` to a non-existent `cms_pecos_providers` table. The daily COUNT(*) returned no row and was recorded as record_count=0, then attested, witness-signed, and chained once per day for the affected window.
snapshot_attestations. Verify any snapshot at /verify/[id].100 attestations on file across 54 source families.
clinical_trials 2 attestations00d9e0a0…d7e9a45dattestation →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.
Forward fix: PR #1035 (commit 8f66f482) repointed the source_ids to the real nppes_providers / pecos_providers tables; the source_id keys are unchanged so the bitemporal history continues under the same family key. · Issued 2026-06-19
cms_care_compare_asc 2 attestationscms_care_compare_dialysis 2 attestationscms_care_compare_hh 2 attestationscms_care_compare_hospice 2 attestationscms_care_compare_nh 1 attestationcms_civil_money_penalties 2 attestationscms_hospital_chow 2 attestationscms_market_saturation 2 attestationscms_mssp_aco_participants 2 attestationscms_open_payments 2 attestationscms_opt_out_affidavits 2 attestationscms_order_referring 2 attestationscms_part_d_prescribers 2 attestationscms_part_d_spending_by_drug 2 attestationscms_pos_facilities 1 attestationcms_price_transparency_enforcement 2 attestationscms_qpp_mips_individual 1 attestationcms_revalidation_due_dates 2 attestationsentities 2 attestationsentity_edges 2 attestationsentity_identifiers 2 attestationsfacility_ownership 2 attestationsfda_drugs_at_fda 2 attestationsfda_enforcement_reports 2 attestationsfda_establishment_registrations 2 attestationsgleif_lei 2 attestationshac_reduction_program 2 attestationshcris_facility_summary 2 attestationshrsa_shortage_areas 2 attestationshrsa_uds_awardees 2 attestationshrsa_uds_quality_measures 2 attestationshrsa_uds_sites 2 attestationsinpatient_utilization_summary 2 attestationsmedicare_physician_service 2 attestationsncci_mue_edits 2 attestationsncci_ptp_edits 2 attestationsnh_health_deficiencies 2 attestationsnh_penalties 2 attestationsnih_reporter_projects 2 attestationsnppes 1 attestationnucc_taxonomy_codes 2 attestationsoig_cia_agreements 2 attestationsoig_leie 1 attestationpbj_daily_nurse_staffing 2 attestationspecos_ppef 1 attestationsam_exclusions 2 attestationssnf_all_owners 2 attestationssnf_enrollments 2 attestationssource_manifest 1 attestationstate_disciplinary_actions 2 attestationsstate_exclusions 1 attestationstate_provider_licenses 2 attestationsun-sanctions 2 attestations