It is not surprising that CMS had to delay enforcement of 5010 compliance in light of the fact that even the small payor community, including a number of MACs and Medicaids, were unable to test and implement 5010 files in production timely; let alone the thousands of providers primarily relying on unprepared clearinghouses and software vendors. A number of payors had announced delays in advance of CMS that they would not meet the deadline, such as Medi-Cal of California which had announced it would not be ready until 2013.