Beginning this year, Medicare Administrative Contractors (MACs) have assumed the responsibility for sending demand letters related to Recovery Audit Contractor (RAC) audits to providers. While providers generally have been able to elect a particular address to ensure centralized RAC correspondence, MACs may not have the same designated address on file. As a result, with MACs taking over demand letter responsibilities, providers no longer can rely on all incoming RAC correspondence being delivered to a particular selected address. Moreover, it appears CMS has refused to require MACs to direct such correspondence to the RAC-designated address. To operationally account for this logistical revision, providers should revisit their RAC-response processes to account for an additional RAC-correspondence point of contact and train staff to recognize such communications. Example demand letters have shown that an "R" preceding the letter number identifies the correspondence as RAC-related.