The Centers for Medicare and Medicaid Services unleashed its actuaries to determine whether hospitals received excess payments as a result of coding increased severity under the MS-DRGs that didn't reflect a real change in case mix. The actuaries have completed their analysis of FY 2008 claims and found that hospitals were overpaid 2.5%, or $2.2 billion, in that year alone. As a result, CMS is proposing "draconian" corrective action, says this analysis from Sg2.