Hospital Star Ratings Explained: CMS and Leapfrog

Two major rating systems grade American hospitals, and they don't always agree. CMS uses a 1 to 5 star system based on broad quality measures. Leapfrog assigns letter grades (A through F) focused specifically on patient safety. A hospital can get 5 CMS stars and a Leapfrog B, or vice versa, because they're measuring overlapping but different things.

CMS Hospital Star Ratings

CMS rates about 3,200 hospitals using roughly 46 quality measures grouped into five categories: mortality (22% weight), safety of care (22%), readmission (22%), patient experience (22%), and timely and effective care (12%). About 71% of hospitals receive 3 stars or above. Ratings are updated annually. Look up any hospital at medicare.gov/care-compare.

Leapfrog Hospital Safety Grade

Leapfrog grades about 3,000 hospitals twice a year (spring and fall) using 22+ performance measures focused on safety: infections, surgical complications, practices to prevent errors, maternity care safety, and staff responsiveness. In the most recent report, about 33% of hospitals earned an A, 25% a B, and 42% received C, D, or F. Check grades at hospitalsafetygrade.org.

Why They Can Disagree

CMS covers broad quality including mortality, readmission rates, and patient experience. Leapfrog focuses heavily on safety and error prevention. A hospital might have excellent outcomes and high patient satisfaction (high CMS stars) but problems with infection rates or surgical safety protocols (low Leapfrog grade). Check both before a planned procedure.

Hospital-Acquired Infections

Hospital-acquired infections are a key component of both rating systems. The CDC reports approximately 687,000 HAIs occur annually in U.S. hospitals, contributing to roughly 72,000 deaths per year. Central line-associated bloodstream infections have decreased about 50% since 2008 due to targeted quality programs. These numbers show progress but also show why checking safety ratings matters.