CMS has published a notice correcting technical errors that appeared in the July 19, 2013 proposed rule updating the Medicare Hospital Outpatient Prospective Payment System (OPPS) and the ambulatory surgical center payments for CY 2014. In addition to making revisions to specific ambulatory payment classifications, the technical corrections result in changes to the proposed OPPS relative payment weights and conversion factor (which generally have the impact of reducing payment rates). CMS is accepting comments on the technical corrections until September 16, 2013.  Updated payment files are posted here.