Identify All Beneficiaries in the Common Working File (CWF) With Dual Eligibilit
CMS requires procedures to identify all beneficiaries with dual
Medicare/Medicaid eligibility at the nine CWF hosts as part of the Compromised Numbers Project. That
capability will allow wider use of the file that the project maintains. In addition program safeguard
contractors (PSCs)/zoned program integrity contractors (ZPICs) require the file to facilitate fraud detection
across the Medicare/Medicaid programs
The Beneficiary Other Insurer Auxiliary (BOIAUX) file in CWF currently carries the Coordination of
Benefits Administration (COBA) ID that can be used to determine the dual Medicare/Medicaid eligibility.
Any open BOI (Beneficiary Other Insurer) occurrence with COBA ID range between 70000 thru 79999 is a
Medicare/Medicaid dual eligible.
Issued by: Centers for Medicare & Medicaid Services (CMS)
Issue Date: August 06, 2010
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