Quality Guide
Hospital Quality Ratings Explained
Stars, grades, scores, rankings — there are multiple systems rating hospital quality, and they don't always agree. Here is what each system measures, why they differ, and which metrics matter most for your specific situation.
CMS Star Ratings (1-5 Stars)
The CMS Overall Hospital Quality Star Rating is the most comprehensive rating system. It uses approximately 46 quality measures across five equally weighted groups:
- Mortality (22%): 30-day death rates for heart attack, heart failure, pneumonia, COPD, stroke, and CABG surgery
- Safety of Care (22%): Hospital-acquired infections, surgical complications, falls, and other safety events
- Readmission (22%): 30-day readmission rates for six conditions
- Patient Experience (22%): HCAHPS survey results on communication, responsiveness, and cleanliness
- Timely & Effective Care (12%): How quickly patients receive care and whether evidence-based treatments are used
About 14% of rated hospitals earn 5 stars, and about 6% receive 1 star. The average is 3 stars.
What CMS Stars Miss
Star ratings have important limitations:
- Hospital-wide average: A hospital can be excellent in one specialty and mediocre in another, but gets one overall rating
- Risk adjustment gaps: The methodology may not fully account for patient complexity at large academic medical centers
- Small hospital advantage: Small hospitals with fewer cases can receive high ratings based on limited data
- Lag time: Data is typically 1-2 years old when ratings are published
Mortality vs. Readmission: Which Matters More?
For life-threatening conditions (heart attack, stroke, major surgery), mortality rates are the most important metric. For planned procedures (joint replacement, elective surgery), readmission rates and complication rates matter more because death is rare for these procedures.
Procedure Volume: The Hidden Quality Metric
Research consistently shows that hospitals (and surgeons) who perform more of a given procedure have better outcomes. For complex surgeries like cardiac bypass, pancreatectomy, or esophagectomy, choosing a high-volume center can significantly reduce your risk of complications. Ask: "How many of these procedures does this hospital perform per year?"
The HospitalCostData Value Score
Our Value Score goes beyond quality alone by combining quality (40%), price (40%), and outcomes (20%). This answers the practical question most patients face: "Where can I get good care without overpaying?"
Related Resources
Frequently Asked Questions
There is no single best system — each measures different things. CMS star ratings are the most comprehensive (46 measures across 5 categories). Leapfrog grades focus on patient safety. U.S. News rankings emphasize specialty expertise and reputation. For most patients, the CMS star rating is the best starting point because it's standardized, risk-adjusted, and covers the broadest range of quality dimensions.
Yes. Star ratings are hospital-wide averages. A hospital might excel in cardiac care (boosting its overall rating) but perform below average in orthopedics. Always check condition-specific metrics like procedure volume, complication rates, and mortality rates for the specific care you need.
Large academic medical centers often receive lower star ratings because they treat the most complex patients, which increases their complication and readmission rates even after risk adjustment. The risk adjustment methodology may not fully account for the extreme severity of cases at these institutions. However, for complex procedures, volume and expertise often matter more than star ratings.