The Centers for Medicare and Medicaid Services (CMS) released the proposed wage index and occupational mix public use files (PUF) on February 22. The data included in the PUF will be used to determine the area wage index for the FFY 2013 Medicare prospective payment systems. These files are available for the purpose of identifying potential data entry or transmission errors made by CMS or their administrative contractors. In addition, if the contractor has proposed any adjustments to wage index data as included in the PUF, revisions related to the adjustments may be requested at this time.