Skip to main content

N155 Remark Code: No Other Insurance on File

N155 is an alert that the payer's records do not show any other insurance for the patient, and it asks you to submit other insurance information for its records. It usually appears when the claim suggested other coverage exists.

Quick facts

Code
N155 (RARC N155)
Status
Active In use since October 31, 2002; last modified April 1, 2007.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • OA (Other Adjustment): Informational. The request is about updating coverage records; liability on the claim comes from its reason codes.
  • CO (Contractual Obligation): If the claim was denied pending other insurance information, the balance stays with the provider until the records are updated.
Official description
Alert: Our records do not indicate that other insurance is on file. Please submit other insurance information for our records.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N155 means

Payers keep a coordination of benefits record for each member. N155 means that record shows no other coverage, yet something (often other-insurance fields filled in on the claim, or a prior payer’s payment) suggested there might be. The payer is asking for the details so its records match reality.

What to do

  1. Ask the patient whether they have any other coverage, including through a spouse, parent, employer, or government program.
  2. If they do, send the other plan’s name, member ID, group number, and subscriber details to the payer, and confirm which plan is primary.
  3. If they don’t, make sure your claim does not list other insurance in CMS-1500 boxes 9 through 9d and 11d, and let the payer know.
  4. Resubmit or request reprocessing if the claim was held.

The eligibility and COB guide explains how coverage order errors lead to this kind of request.

Codes that may appear with N155

  • OA-22 (This care may be covered by another payer per coordination of benefits.): The care may be covered by another payer per coordination of benefits.
  • CO-16 (Claim/service lacks information or has submission/billing error(s).): Information needed for adjudication, such as other coverage details, was missing.
  • MA92 (Missing plan information for other insurance.): Missing plan information for other insurance.
  • N245 (Incomplete/invalid plan information for other insurance.): Incomplete or invalid plan information for other insurance.
  • N196 (Alert: Patient eligible to apply for other coverage which may be primary.): The patient may be eligible for other coverage that could be primary.

N155 FAQ

Why does the payer want other insurance information?

To coordinate benefits correctly. If the patient has another plan, the payer needs to know which pays first.

How do I send it?

Through the payer's portal, a coordination of benefits questionnaire, or by having the member call. Some payers accept it on a corrected claim in the other-insurance fields.

What if the patient has no other insurance?

Confirm with the patient and tell the payer, so it records that there is no other coverage.