On March 24, 2010, as a result of a whistleblower lawsuit filed in 2005, a federal district court judge in the Middle District of Tennessee found that Renal Care Group (RCG), Renal Care Group Supply Company (RCGSC), and their successor-in-interest Fresenius Medical Care Holdings, Inc. (Fresenius), (collectively the defendants), had submitted claims for reimbursement to Medicare and that they must return more than $19.3 million of those funds to the government.