Hospital Compare datasets

These are the official datasets used on the Hospital Compare Website provided by the Centers for Medicare & Medicaid Services. These data allow you to compare the quality of care at over 4,000 Medicare-certified hospitals across the country.

Hospital Compare data was last updated on Oct 31, 2018.


  • The January refresh of Hospital Compare will move to February. Please check back for updates.
  • CMS did not update Hospital Compare Overall Hospital Quality Star Rating data in July 2018. Visit QualityNet for more information. Please submit questions to
  • In July, CMS added two new measures to Hospital Compare: Hospital return days for pneumonia patients (EDAC-30_PN) and Percentage of patients who received appropriate care for severe sepsis and septic shock (SEP-1). The following measure was added to the downloadable database only: Average time patients spent in the emergency department before being sent home (OP-18c).
  • CMS is no longer reporting the HCAHPS pain measure from Hospital Compare and the downloadable databases, and has excluded it from the calculation of the HCAHPS Summary Star Rating.
  • Diagnosis coding switched from ICD-9 to ICD-10 in 2015. Data for the FY 2018 recalibrated Patient Safety Indicator (PSI) measures only represent the 21-month performance period of ICD-9 claims (10/1/2015 – 6/30/2017).
  • VA outcomes data have been incorporated into the workflow. Please note data collection periods are different for VA hospitals for the following measure groups: PSIs, 30-day readmission rates, and 30-day death (mortality) rates. Visit Hospital Compare for details on the data collection periods.
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