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
This page is the public, versioned methodology for the Nursing-Home Quality by State (CMS Care Compare) dataset. It documents how every figure on the matched Fonteum Research study, /api/v1 endpoint, and Audit Pack was constructed — from registered public-source ingest through aggregation rules to the rendered output. It exists so buyers can satisfy auditor questions by linking to a single durable URL.
Every section below is the source of truth. Where the methodology differs from the underlying source's own description (for example: which taxonomies count, how Type-1 vs Type-2 NPIs are treated, how density per 100k is computed), the rule lives here, not in the source. Methodology versions (v2026.05.0 today) increment when those rules change; data refreshes within a methodology version are tracked separately under refresh historyand surface as the “Last refreshed” banner above.
The Fonteum sources registry holds the canonical entry for each source family — Tier classification, ToS posture, refresh schedule, and live-vs-pending status: /sources.
An independent researcher with access only to the public sources listed above can recreate this dataset by following these steps. Discrepancies between an independent reproduction and the published figures belong in /corrections-log; we publish them when they arise.
Limitations are surfaced explicitly, not buried. Each item below is a constraint a buyer’s compliance team should review before relying on the dataset for a specific use case.
Every field surfaced from this dataset on the API and rendered surfaces. Source, refresh cadence, and confidence are recorded per field, not per dataset.
| Field | Description | Source | Refresh | Confidence |
|---|---|---|---|---|
facility_ccn | CMS Certification Number — facility identifier on the CMS dataset. | CMS Care Compare — Nursing Home Compare ↗ | Quarterly | 1.0 (verbatim) |
state | Facility state (USPS code). | CMS Care Compare — Nursing Home Compare ↗ | Quarterly | 1.0 (verbatim) |
overall_rating | CMS Five-Star Quality Rating (1-5) for the facility. | CMS Care Compare — Nursing Home Compare ↗ | Quarterly | 1.0 (verbatim) |
rating_date | CMS-published rating publication date. | CMS Care Compare — Nursing Home Compare ↗ | Quarterly | 1.0 (verbatim) |
Every methodology version bump is recorded here with the change rationale. Data-only refreshes (no methodology change) appear as same-version entries with a refresh date.
| Version | Released | What changed |
|---|---|---|
v2026.05.0current | May 6, 2026 | Initial Audit Pack release. Methodology, provenance map, reproducibility statement, and limitations stack baselined. |
For procurement attachments, audit responses, footer attribution, or academic use. Pick a format and copy.
Methodology questions: methodology@fonteum.com. Data corrections: /corrections-log. B2B inquiries: api@fonteum.com.
This page is the durable URL a buyer’s compliance officer can link from their product. The version pinned at the URL (v2026.05.0) is the active methodology; historical versions remain accessible at the same URL with prior-version content available in the Version history table.