When submitting a secondary claim, you must attach a copy of the primary carrier's EOB to the completed CMS-1500 or UB-04.

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When submitting a secondary claim, it is necessary to attach a copy of the primary carrier's EOB (Explanation of Benefits) to the completed CMS-1500 or UB-04. This helps the secondary carrier in determining the allowed amount and the remaining balance of the claim after the primary carrier has paid their portion.

When Submitting a Secondary Claim, You Must Attach a Copy