BACKGROUND: Before 2007, erythropoiesis-stimulating agents (ESAs) were the highest-expenditure drug in the Medicare system. In 2007, CMS issued a reimbursement policy change for ESAs used by cancer patients. However, empirical evidence is currently lacking to evaluate medical costs after the policy change, especially by sex and racial/ethnic groups.
OBJECTIVE:To examine the impact of the Medicare reimbursement policy change and associated racial/ethnic and sex disparities on medical costs for cancer patients who were new users of ESAs.
METHODS:This study was an exploratory retrospective treatment effectiveness study, which used SEER-Medicare linked data. A difference-in-difference design was used that incorporated a control group of patients with chronic kidney disease. A generalized linear model, with a log link and a gamma distribution, was used to examine medical costs.