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Creating Additional Medicare Secondary Payer (MSP) Error Codes to Better Identify Incoming MSP Claims that Conflict with MSP Records Found on the Common Working File (CWF)
The purpose of this Change Request (CR) is to add additional MSP error codes that better identify Part B and Durable Medical Equipment (DME) MSP claims that conflict with current MSP Group Health Plan (GHP) records in CWF.
Issued by: Centers for Medicare & Medicaid Services (CMS)
Issue Date: May 27, 2026
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