The problem causing erroneous E4502 suspensions has been resolved, but you still may see some fallout. “Because this reason code is returned by the Common Working File (CWF), you may continue to see claims with reason code E4502 until all claims affected are cycled out of CWF,” HHH Medicare Administrative Contractor CGS says in a message to providers. “CGS will monitor status/location S M4502 and release all billing transactions, NOEs, and RAPs, with reason code E4502 to continue processing,” the MAC says.