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The calculations of the 30-day readmission results including the excess readmission ratio use the same 30-day readmission measures and the same data period (July 1, 2009 through June 30, 2012) as the Hospital Inpatient Quality Reporting Program. However, for the Hospital Readmissions Reduction Program, the calculations include only acute care hospitals paid under Inpatient Prospective Payment System and Maryland hospitals, while for the Hospital Inpatient Quality Reporting Program, the calculations also include other types of acute hospitals such as Critical Access Hospitals and Veteran’s Health Administration hospitals.

To make comparisons fair, hospitals’ 30-day readmission results are "risk-adjusted” to account for differences in hospital patients’ characteristics that may make readmission more likely, including age, gender, past medical history, and other diseases or conditions (comorbidities) that patients had when they arrived at the hospital. Medicare beneficiaries enrolled in Medicare Advantage are not included.

For more information on the measure calculations, visit the Readmissions Reduction QualityNet Page.