On December 27, 2010, the Centers for Medicare & Medicaid Services (CMS) published a notice requesting comments on an ACA provision that requires the expansion of the RAC program to Medicare Parts C and D (the RAC program currently applies only to fee-for-service Medicare). The goal of the RAC program is to identify improper payments to Medicare providers, and RACs are paid contingency fees based on overpayments collected from providers and for underpayments identified. CMS will accept comments on the notice until February 25, 2011.