Common Working File (CWF) Medicare Secondary Payer ( MSP) Coordination of Benefits Contractor (COBC) Number Update and Implementation of MSP Group Health Plan (GHP) COBC Hierarchy Rules as related to Mandatory Insurer Reporting
Updating the hierarchy of COBC contractor codes and updating the CWF
error codes to accommodate the implementation of this change request.
Issued by: Centers for Medicare & Medicaid Services (CMS)
Issue Date: November 19, 2010
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