Resolve a provider's identity: an NPI, an EIN, or an organisation name (+ state) -> the Medicare CCN(s) it maps to, the CCN's provider type from the CCN authority (vlada_curated.dim_provider_ccn: 101,528 CCNs across hospitals, SNFs, home health, hospice, FQHC, RHC, ASC, dialysis, IRF, LTCH), the NPPES record, the PECOS Medicare enrollment(s) with organisation name and provider type, and (include_ownership, default true) the PECOS ownership edges — owners, percentage, and the private-equity / REIT / holding-company / chain flags. Every candidate carries its match method, a confidence, and the source table per field. NPI->CCN is resolved by AGREEMENT across two bridges (provider_facility_xref, dim_hospital_external); if they disagree the answer is ambiguous_conflict with both candidates and no resolved CCN, never a guess. An unknown NPI returns unresolved with the reason, not an error. EIN and name resolution reach hospitals only (the estate's EIN-bearing roster); a shared-system EIN lists every CCN as a candidate.