Overall hospital quality star rating
The overall hospital quality star rating summarize a variety of measures across 7 areas of quality into a single star rating for each hospital. Once reporting thresholds are met, a hospital’s overall quality star rating is calculated using only those measures for which data are available. This may include as few as 9 or as many as 51 measures. The average is about 37 measures. Hospitals report data to the Centers for Medicare & Medicaid Services - Opens in a new window through the Hospital Inpatient Quality Reporting (IQR) Program - Opens in a new window Exit Disclaimer - Opens in a new window and the Hospital Outpatient Quality Reporting (OQR) Program - Opens in a new window Exit Disclaimer - Opens in a new window. Star ratings aren't calculated for Veterans Health Administration (VHA) or Department of Defense (DoD) hospitals.
The methodology uses a statistical model known as a latent variable model. Seven different latent variable models are used to calculate scores for 7 groups of measures.
- Safety of Care
- Patient Experience
- Effectiveness of Care
- Timeliness of Care
- Efficient Use of Medical Imaging
A hospital summary score is then calculated by taking the weighted average of these group scores. If a hospital is missing a measure category or group, the weights are redistributed amongst the qualifying measure categories or groups.
Finally, the overall hospital quality star rating is calculated using the hospital summary score.
Only hospitals that have at least 3 measures within at least 3 measure groups or categories, including one outcome group (mortality, safety, or readmission), are eligible for an overall hospital quality star rating. Not all hospitals report all measures. Therefore, some hospitals may not be eligible for an overall quality star rating.
The comprehensive methodology report - Opens in a new window provides additional detail on the methodology used to calculate the overall hospital quality star rating.
National distribution of overall hospital ratings
The following table shows the national distribution of the overall rating.
|Overall Rating||Number of Hospitals (N=4,586, %)|
|1 star||228 (4.97%)|
|2 stars||710 (15.48%)|
|3 stars||1,120 (24.42%)|
|4 stars||1,138 (24.82%)|
|5 stars||407 (8.88%)|
|N/A[2 view 2016 fact sheets- Opens in a new window]||983 (21.43%)|
The methodology for calculating the overall hospital quality star rating was developed with input from stakeholders and members of the public. Learn more about the methodology. - Opens in a new window
For general questions regarding the overall hospital rating, go to the QualityNet Question and Answer Tool - Opens in a new window.