CMS has released the revised CMS-855S Medicare supplier enrollment application, version 01/13. Suppliers may use the 07/11 version of the CMS-855S through May 7, 2013, at which time any information received on the obsolete form will be returned to the supplier, according to the National Supplier Clearinghouse. CMS also has posted an updated (1/13) version of the CMS 855O form, the Medicare Enrollment Application – Registration for Eligible Ordering and Referring Physicians and Non-Physician Practitioners.