Massachusetts General Hospital

CMS Care Compare · 6 facility types · data.cms.gov · US Government Work

What is the CMS overall star rating for Massachusetts General Hospital?

Massachusetts General Hospital holds a CMS overall star rating of 5 out of 5 as of Q2 2026. CMS calculates this rating quarterly from quality measures spanning mortality, safety of care, readmission, patient experience, and timely and effective care, all drawn from the CMS Care Compare program.

Who owns Massachusetts General Hospital?

Massachusetts General Hospital is classified by CMS as "Voluntary non-profit - Private". Ownership type is reported by the hospital to CMS and published in the Hospital General Information dataset; it describes the controlling entity, not the quality of care, which Fonteum reports separately and traces to each source row.

How many CMS quality measures does Fonteum track for Massachusetts General Hospital?

Fonteum publishes 184 CMS quality measures for Massachusetts General Hospital across 6 groups — patient experience (hcahps), mortality, readmissions, complications and patient safety, healthcare-associated infections, timely and effective care. Every measure is a separate provenance claim signed to the CMS dataset, reporting period, and source row it was asserted from, and is hover-traceable on this page.

Where does Massachusetts General Hospital's quality data come from?

Massachusetts General Hospital's data is drawn directly from 6 primary CMS Care Compare datasets published on data.cms.gov, including patient survey, mortality, readmission, complication, infection, and timely-care files. Fonteum re-publishes each value with a chained 14-field provenance record rather than an aggregated score.

What does CMS Certification Number 220071 identify?

The CMS Certification Number (CCN) 220071 is the federal identifier Medicare assigns to Massachusetts General Hospital. It is unique, dated, and federally issued, and it links this hospital across every CMS dataset — cost reports, Care Compare quality files, and the Provider of Services file — which is how Fonteum joins Massachusetts General Hospital's records.

Does Massachusetts General Hospital provide emergency services?

Yes. CMS records that Massachusetts General Hospital provides emergency services, per the Hospital General Information dataset as of Q2 2026. Emergency-service status indicates the hospital operates an emergency department; it is reported by the hospital to CMS and chained to its source row on this page.