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.
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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 57 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 57 source families.
clinical_trials 1 attestationcms_care_compare_asc 1 attestationLive 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_dialysis 1 attestationcms_care_compare_hh 1 attestationcms_care_compare_hospice 1 attestationcms_care_compare_nh 7 attestationscms_civil_money_penalties 1 attestationcms_hospital_chow 1 attestationcms_market_saturation 1 attestationcms_mssp_aco_participants 1 attestationcms_open_payments 1 attestationcms_opt_out_affidavits 1 attestationcms_order_referring 1 attestationcms_part_d_prescribers 1 attestationcms_part_d_spending_by_drug 1 attestationcms_pos_facilities 7 attestationscms_price_transparency_enforcement 1 attestationcms_qpp_mips_individual 7 attestationscms_revalidation_due_dates 1 attestationcms-inpatient-utilization 1 attestationcms-ncci-mue-edits 1 attestationcms-ncci-ptp-edits 1 attestationcms-qpp-mips 1 attestationentities 1 attestationentity_edges 1 attestationentity_identifiers 1 attestationfacility_ownership 1 attestationfda_drugs_at_fda 1 attestationfda_enforcement_reports 1 attestationfda_establishment_registrations 1 attestationgleif_lei 1 attestationhac_reduction_program 1 attestationhcris_facility_summary 1 attestationhrsa_shortage_areas 1 attestationhrsa_uds_awardees 1 attestationhrsa_uds_quality_measures 1 attestationhrsa_uds_sites 1 attestationinpatient_utilization_summary 1 attestationmedicare_physician_service 1 attestationncci_mue_edits 1 attestationncci_ptp_edits 1 attestationnh_health_deficiencies 1 attestationnh_penalties 1 attestationnih_reporter_projects 1 attestationnppes 7 attestationsnucc_taxonomy_codes 1 attestationoig_cia_agreements 1 attestationoig_leie 7 attestationspbj_daily_nurse_staffing 1 attestationpecos_ppef 7 attestationssam_exclusions 1 attestationsnf_all_owners 1 attestationsnf_enrollments 1 attestationsource_manifest 8 attestationsstate_disciplinary_actions 1 attestationstate_exclusions 1 attestationstate_provider_licenses 1 attestation