CMS has released new statistics on the Medicare Fee-for-Service Recovery Audit Contractor (RAC) program, under which CMS contractors are tasked with detecting and correcting past improper Medicare payments. As of the third quarter of FY 2011, RACs have corrected $592.5 million in total payments, including $233.4 million in provider overpayments and $55.9 million in underpayments. Top overpayment issues identified by the RACs include undocumented medical necessity for renal and urinary tract disorders, extensive operating room procedure unrelated to the principal diagnosis, improper Medicare payments for DMEPOS provided during an inpatient stay, and the medical necessity of minor surgery and other treatment billed as inpatient care.