CMS Care Compare hospital quality ratings — the data behind medicare.gov hospital ratings, for all ~5,300 Medicare-certified US hospitals. Look up by facilityId (CMS certification number), or filter by state, city, and name (partial match). Each row: facility id/name/address/phone, hospital type + ownership, emergency services, overall star rating (1-5), and per-domain measure summaries (mortality, safety of care, readmission, patient experience, timeliness, effectiveness) showing whether the hospital performs better/same/worse than the national average. Rows returned with CMS's documented column names. Public-domain federal data.