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N5 Remark Code: Prior Payer EOB Received, No Claim

N5 means the payer received an explanation of benefits from the patient's previous (primary) payer, but it has no claim on file to attach it to. The provider generally needs to submit the claim itself so the EOB can be matched and processed.

Quick facts

Code
N5 (RARC N5)
Status
Active In use since January 1, 2000.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • OA (Other Adjustment): The payer is reporting an administrative mismatch rather than a coverage decision. Nothing is owed by the patient because of N5 alone.
  • CO (Contractual Obligation): Some payers use CO to show the provider must act, typically by filing the claim, before any payment can be made.
Official description
EOB received from previous payer. Claim not on file.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N5 means

Coordination of benefits normally works in one direction: the provider files a secondary claim that includes, or is accompanied by, the primary payer’s EOB. N5 describes the situation where only half of that pair arrived. The payer has the prior carrier’s explanation of benefits in hand, but it cannot find a claim from you for the same patient and dates of service.

Because the official text says the claim is not on file, the fix is usually to get a valid claim to the payer, not to chase the primary insurer for paperwork. Some internal payer guides treat N5 as a request to wait for the primary EOB, so if the wording on your remittance seems unclear, confirm with the payer which document it is missing.

Common causes

  • The patient or the primary plan sent the EOB directly to the secondary payer.
  • The billing office mailed the EOB but the secondary claim never went out or was rejected at the clearinghouse.
  • The claim was filed under a different member ID, name spelling, or date of birth, so the payer could not link it.
  • A crossover from the primary payer was expected but did not happen.

What to do

  1. Search your clearinghouse reports for the secondary claim. If it was rejected before reaching the payer, fix the rejection first; see rejection vs. denial.
  2. Verify the member details you would use against the payer’s eligibility response.
  3. Submit the secondary claim with the primary payer’s paid amount and adjustments, or with the EOB attached if the payer takes paper.
  4. Call the payer if you believe a claim is already on file, and ask it to link the EOB rather than risk a duplicate.

How to prevent it

  • Release secondary claims automatically once the primary ERA posts.
  • Do not mail EOBs by themselves; send them only as part of a claim submission.
  • Check eligibility for secondary coverage at intake so the payer order and IDs are right from the start.

Codes that may appear with N5

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): Information needed for adjudication is missing; here the missing piece is the claim that goes with the prior payer's EOB.
  • OA-22 (This care may be covered by another payer per coordination of benefits.): The payer recognizes another plan is involved in coordination of benefits and needs a proper secondary claim.
  • N4 (Missing/Incomplete/Invalid prior Insurance Carrier(s)): The reverse problem: the claim is on file but the prior payer's EOB is missing or invalid.
  • MA04 (Secondary payment cannot be considered without the identity of or payment information from the primary payer.): Secondary payment cannot be considered because primary payer identity or payment details were absent.
  • N8 (Crossover claim denied by previous payer and complete claim data not forwarded.): A crossover arrived from the previous payer without complete claim data and must be resubmitted directly.
  • N522 (Duplicate of a claim processed, or to be processed, as a crossover claim.): Warns that a claim duplicates one processed, or about to be processed, as a crossover.

N5 FAQ

Why would a payer have the EOB but not the claim?

The EOB may have been sent separately by the patient, mailed by the office without a claim form, or forwarded under a different identifier so it could not be linked to an existing claim.

Should I send the EOB again?

Send it with the claim if the payer requires paper attachments. For electronic secondary claims, the primary payer's payment and adjustment data usually travels inside the 837 itself.

Could N5 mean a claim was sent to the wrong member ID?

Yes, that is worth checking. If your claim is on file under a different subscriber or dependent ID, the payer may not be able to connect it to the EOB it received.