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National Correct Coding Initiative (NCCI) New/Updated Add-On Code (AOC) Edit File Format and Creation of an AOC File Retrieval Process in the Multi-Carrier System (MCS) – Implementation
This purpose of this Change Request (CR) is to establish a quarterly recurring update, provide instructions for MCS system changes required to automate the AOC File retrieval as well as establish standardized MCS auditing for claims processing.
Issued by: Centers for Medicare & Medicaid Services (CMS)
Issue Date: March 26, 2026
DISCLAIMER: The contents of this database lack the force and effect of law, except as authorized by law (including Medicare Advantage Rate Announcements and Advance Notices) or as specifically incorporated into a contract. The Department may not cite, use, or rely on any guidance that is not posted on the guidance repository, except to establish historical facts.