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Modifications to the National Coordination of Benefits Agreement (COBA) Medicare Claims Crossover Process

The purpose of this Change Request (CR) is to clarify the actions that our Medicare Administrative Contractors (MACs) should be taking in association with certain kinds of mass adjustment claims activities. The current practices that MACs are following are resulting in claims being marked incorrectly as certain kinds of mass adjustments under the COBA claims crossover process.

Download the Guidance Document

Issued by: Centers for Medicare & Medicaid Services (CMS)

Issue Date: July 24, 2025

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.