Returns one hospital's CMS Care Compare quality record by CCN: the overall star rating (1-5) with hospital type / ownership; every Care Compare measure for the hospital (mortality and complication rates, unplanned readmission / ED-return rates, timely and effective care, healthcare-associated infections SIRs, outpatient imaging efficiency, maternal health) with the score, CMS's compared-to-national verdict where published, denominator, confidence bounds and measurement window; the HCAHPS patient-experience summary (summary star + per-dimension star ratings and linear mean scores) for the latest reporting year the hospital has; and the HRRP excess readmission ratios per condition for the latest fiscal year (ratio > 1 = more readmissions than nationally expected). Inputs: ccn (required, 6-char CMS certification number); optional measure_group (alias: measure_source) to get ONE group's measure rows (complications_deaths | unplanned_visits | timely_care | healthcare_assoc_infections | outpatient_imaging_efficiency | maternal_health); optional limit and offset to page the measure rows (default limit 25 once detail is asked for).

THE DEFAULT CALL IS A SUMMARY: ccn alone returns the overall rating, the HCAHPS and HRRP blocks, and the measure GROUPS with a count each (summary.measure_groups: measure_count / available / not_available / vs_national per group) — NOT the ~108 measure rows, which exceed the response budget for a single hospital. Totals are still reported (summary.measure_count) and row_counts.measures names what was withheld; ask again with measure_group, or limit / offset, for the rows.

RETURNS a detail payload: value.summary (facility, overall_rating with status + footnote, hcahps_summary_star, counts, measure_groups, measure_detail_mode, and a blocks map saying which of overall_rating / measures / hcahps / hrrp are available for THIS hospital); value.measures, value.hcahps, value.hrrp row lists. Every row carries status = available | not_available (with the CMS footnote or reason), source_table and source_vintage (asserted_at). Nothing is fabricated: a suppressed or unreported measure is not_available, never a zero; an unrated hospital reports overall_rating null with the CMS footnote. All four sources are read WHERE is_current = true. An unknown CCN returns found=false.

SOURCE: CMS Provider Data Catalog (Care Compare) Hospital General Information, hospital measure files, HCAHPS, and the HRRP hospital file.