The Centers for Medicare & Medicaid Services (CMS) has identified a claim processing problem impacting Skilled Nursing Facility (SNF) type of bills 18x and 21x containing Healthcare Common Procedure Coding System (HCPCS) code AAAxx and Revenue Code 0022. We are holding these claims. As soon as a system fix is in place and successfully tested, these claims will be released for processing. We appreciate your patience and apologize for any inconvenience this may cause.