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CMS POSCMS Provider of Services (POS) — iQIES Facility Registry
U.S. Centers for Medicare and Medicaid Services · Tier-2 · profile-enrichment (renders on matched profiles)
The CMS Provider of Services (POS) file is the master facility registry for all Medicare-certified providers. Published via the iQIES (Internet Quality Improvement and Evaluation System) portal, it assigns a CMS Certification Number (CCN) to every nursing home, hospital, home health agency, hospice, dialysis facility, and ambulatory surgical center participating in Medicare. Every subsequent Care Compare source family joins to this table via CCN.
How this source shows up on Fonteum.
The POS file provides the CCN backbone for all Care Compare facility joins. Facility name, type, address, state, and participation/termination dates render on Care Compare brand-hub pages with full provenance (source · quarter · methodology version). No NPI is included in the iQIES POS export; NPI cross-reference is deferred to the NPPES join wave.
What this source does NOT mean
The POS file identifies Medicare-certified facilities; it is not a quality rating, inspection record, or complaint database. A facility listed in POS is Medicare-enrolled — it has met enrollment requirements — but that is distinct from performance, staffing, or deficiency history.
Per-field display contract.
Every field below has a `display_allowed` flag in the §94 provenance schema. Write-locked fields are captured to provenance for audit but never rendered on profile pages.
Renders on profile
12 fieldsWhat we can’t infer from this source.
- iQIES does not include NPI in the POS export; NPI cross-reference requires a separate NPPES join wave.
- County field contains SSA county code (not county name) — human-readable county requires FIPS cross-reference.
- Terminated facilities are retained in the table (termination_date set) — display logic must filter by termination status for active-facility counts.
- Chain affiliation reflects mlt_fac_org_name as reported to CMS; chain boundaries may not match commercial ownership databases.
- Quarterly cadence — data lags current enrollment by up to 90 days.
Authority, license, refresh cadence.
Authority
U.S. Centers for Medicare and Medicaid Services
Tier
Tier-2 · profile-enrichment (renders on matched profiles)
Refresh cadence
Quarterly — CMS publishes a fresh iQIES POS CSV each quarter (Q1–Q4). Fonteum ingests the latest quarter within 30 days of publication.
License
U.S. government public-domain works (17 U.S.C. § 105). Federal public record. Attribution required: 'Source: CMS Provider of Services · Q{N} {YYYY}'. License ↗
Attribution requirement
Source: CMS Provider of Services (iQIES) · Q{N} {YYYY}
What the source allows.
U.S. government public-domain works (17 U.S.C. § 105). CMS publishes the POS file as a direct CSV download at data.cms.gov/provider-data with explicit redistribution rights. Fonteum mirrors the source bytes (SHA-256 attested) and publishes a per-snapshot manifest under data/pos/.
What a single field looks like in the graph.
A worked example. Every field surfaced from this source carries this shape of provenance line — source · last checked · display rule · confidence (when applicable).
Field
Facility type (care-compare page)
Sample value
Facility type: Skilled Nursing Facility · CCN 555555 · Q1 2026
Provenance line
Source: CMS Provider of Services (iQIES) · Q1 2026 · Methodology cms-pos/v1 · Display rule: provider_type + ccn render on Care Compare facility page with quarter inline
- /sources → The full source library — every dataset Fonteum cites.
- /data-provenance → The provider graph — pipeline diagram, source-family clusters, field-level provenance examples, display rules.
- /methodology → Network-wide sourcing, refresh cadence, and corrections policy.
- /editorial-policy → Independence, sourcing, conflicts, corrections, retractions.