On November 17, 2008, CMS reported that the improper payment rate for the Medicare, Medicaid and SCHIP programs fell from 3.9% in FY 2007 to 3.6% percent in FY 2008. For the Medicare fee-for-service program, most improper payments were due to claims for services that were medically unnecessary or incorrectly coded, while the vast majority of Medicaid and SCHIP errors are due to inadequate documentation. CMS also reported the Medicare Advantage improper payment rate for the first time; that rate was 10.6% in 2006, primarily reflecting health plan errors in documenting members’ diagnoses. CMS also is developing methodologies to report the Medicare Part D error rate in the future.