EOB denial code N4: what it means

What it means

The insurer needs the Explanation of Benefits from your other (primary) insurance and did not receive a complete, valid copy.

Official X12 description

“Missing/Incomplete/Invalid prior Insurance Carrier(s) EOB.”

Typical cause

You have more than one plan and the secondary plan needs the primary plan's EOB to coordinate payment.

What to do next

1. 1Get the EOB from your primary insurer for this claim.
2. 2Give it to your provider's billing office so they can submit it to the secondary plan.