Coordination of Benefits (COB)
The Coordination of Benefits (COB) Contractor consolidates the activities that support the collection, management, and reporting of other insurance coverage for Medicare beneficiaries. The purposes of the COB program are to identify the health benefits available to a Medicare beneficiary and to coordinate the payment process to prevent mistaken payment of Medicare benefits.
On occasion it may be necessary for the supplier to contact the COB. Some common examples of reasons to contact are below:
- Verify if Medicare is primary or secondary
- Report changes to a beneficiary's health coverage
- Report a beneficiary's accident/injury
- You may contact the COB by calling a Customer Service Representative or through Written Correspondence.
COB Contractor Customer Service: 1-800-999-1118
Written Inquiries:
Medicare – Coordination of Benefits
P.O. BOX 5041
New York, NY 10274-5041
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