Remark Code N4 on Your EOB — Meaning & What to Do

Remittance Advice Remark Code (RARC)

What remark code N4 means: Missing or incomplete information about other insurance is holding up the claim.
What to do about remark code N4: Give your insurer your other/secondary coverage details.

Remark codes add detail to a claim decision. They appear alongside the main adjustment codes on your Explanation of Benefits or remittance notice, giving the specific reason behind remark code N4.

Seeing remark code N4 on your EOB?
A denial code tells you what the payer reported, but it may not tell the whole story. Reviewing your EOB and bill together can help clarify what may need attention.

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Related codes

RARC N1You may be able to appeal this decision — see your plan's appeal rights. RARC N19A dependent procedure code was billed without its required primary code. RARC N479The Explanation of Benefits from the primary insurer is missing. RARC N56The procedure code billed was not correct for the service described.

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Frequently asked questions about Remark code N4

What does remark code N4 mean on my EOB?

Missing or incomplete information about other insurance is holding up the claim.

What should I do about remark code N4?

Give your insurer your other/secondary coverage details.

Seeing this code on your own EOB?
Upload the EOB, the bill, or both — MD Bill Check reads the codes on your documents, compares them side by side, and flags what's worth questioning. Free, no account needed.

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Last reviewed 2026-07-07 · MDBillCheck Editorial Team. Plain-English explanations are original wording; always verify the specific reason with your insurer.