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Background. The Centers for Medicare and Medicaid Services tracks quality measures, including surgical site infection (SSI) rates. The degree of correlation between hospitals' Medicare and Private Payer SSI outcomes is unknown.

Methods. Using 2009 inpatient claims data from California and New York, we evaluated SSI following coronary artery bypass graft (CABG) surgery for Medicare patients≥ 65 years old vs Private Payer patients 18-64 years old. We screened claims within 90 days of surgery for codes suggestive of SSI. We separately analyzed the Medicare and Private Payer groups using generalized linear mixed models to predict the odds of infection at each hospital. Within group, models were adjusted for age, gender, and comorbidities. We assessed the relationship between the odds of infection for Medicare and Private Payer patients within the same hospital using a Pearson correlation. We repeated …