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
CMS-published 5-star ratings, profit-vs-nonprofit status, chain affiliation, and service offerings (in-center hemodialysis, peritoneal, home hemodialysis training) for every ESRD facility in the country, with explicit suppression flags for fewer-than-11-patient measure windows.
See the Audit Pack →90.2% of dialysis facilities are chain-owned in the current snapshot — concentrated under DaVita, Fresenius, and a handful of regional chains. 7,072 carry a CMS-published 5-star rating (mean 2.87 ★); the remaining 485 carry no public rating because of low patient volume in the measure window.
Source: CMS Care Compare · Dialysis Facility (23ew-n7w9) · Source-modified 2026-03-25 · Snapshot 2026-05-07.
Every facility in the CMS Care Compare Dialysis dataset — identity, ownership, certification, service offerings.
Every state with enough Medicare-certified dialysis facilities to report has its own quality page; the data is also in the snapshot and audit-pack export.
CMS-published star rating computed from ESRD QIP measures (clinical, reporting, patient experience). Suppression for <11 patients flagged explicitly.
Dialysis is unusually consolidated. Fonteum surfaces chain affiliation as a per-facility column, not a hidden metadata field.