Nursing-Home CMS-2567 Deficiency Findings: an open dataset (Dark Health Data)

Dark Health Data: CMS-2567 nursing-home Statements of Deficiency (OCR for scanned pages), extracted via Claude claude-haiku-4-5 with a verification layer (grounding, neurosymbolic constraints, ensemble, conformal gate). This release (v0.4.4) — expanded national crawl: 30,693 records from 1,739 source documents (1,275 facilities): 18,711 cited deficiencies, 11,982 plans of correction. Every record carries full provenance and a quality/trust score; nothing is imputed or dropped. AI-extracted, not yet independently validated — preliminary; filter on the trust score. Public-record documents only; no PHI. Code (Apache-2.0): github.com/sanjaybasu/dark-health-data. CC0-1.0.