MAC Responsibility After Workload Transition

12.4.2.1 – MAC Responsibility After Workload Transition (Rev. 13678; Issued: 03-12-26; Effective: 04-13-26; Implementation: 04-13-26) When the workload transitions from one MAC to another, the MAC that assumes the workload shall follow up on no documentation claims, MAC feedback, appeals, and all other efforts needed to produce an accurate improper payment rate. The assuming MAC shall not have access to the data until the individual workload has transitioned, unless otherwise negotiated with the outgoing MAC or approved by CMS. For CERT reporting purposes, any error will be assigned to the MAC that was responsible for the workload at the time the claim was processed.