On May 6, 2013, CMS published a proposed rule to update Medicare skilled nursing facility PPS rates for FY 2014 and make other updates to SNF reimbursement policy. CMS estimates that the proposed rule would increase aggregate Medicare payments to SNFs in FY 2014 by $500 million, or 1.4%, compared to FY 2013. Specifically, SNF PPS rates would be updated to reflect a 2.3% market basket increase that is reduced by a 0.4 percentage point multifactor productivity adjustment required by the ACA, and that is further reduced by a proposed 0.5 percentage point forecast error correction. Specifically, CMS proposes a technical change in the methodology for determining whether to make a forecast error correction when the difference between the actual and projected market basket percentage change exceeds 0.5%. By modifying how CMS determines the forecast error when it rounds to 0.5%, this policy would result in a 0.5 percentage point reduction in the FY 2014 market basket update. CMS also proposes to rebase the SNF market basket to reflect FY 2010 data, rather than data from FY 2004, and to make changes to the components of the SNF market basket index. With regard to therapy services, CMS proposes to add an item to the Minimum Data Set (MDS) to record the number of distinct calendar days of therapy provided to a beneficiary by all rehabilitation disciplines over the 7-day look-back period, and to specify the number of calendar days of therapy required to qualify for the Medium Rehab (RM) and Low Rehab (RL) Category Resource Utilization Group (RUG). CMS will accept comments on the proposed rule until July 1, 2013.