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N191 Remark Code: Provider Must Update Insurance Info

N191 means the provider must contact the payer directly to update insurance information, such as other coverage or coordination of benefits details, before the claim can be processed correctly. Changing the claim alone will not fix the payer's records.

Code: N191 (RARC N191)
Status: Active In use since February 28, 2003.
Code set: Remittance Advice Remark Codes (RARC)
Group codes: CO (Contractual Obligation): The claim was denied or held until the payer's records are updated. It is on the provider to act, not something to bill to the patient.
OA (Other Adjustment): Other adjustment used while the payer waits for updated coverage information.
Official description: The provider must update insurance information directly with payer.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What N191 means

N191 tells the billing office that the payer’s own member file is out of date and that the provider needs to call or write in to correct it. Most often the problem is coordination of benefits: the payer thinks the patient has other insurance that is primary, or it has the wrong details for that other coverage. A corrected claim will not fix that, because adjudication checks the payer’s stored records, not just the data submitted.

It often appears with CARC 22 (another payer may be primary) or CARC 109.

Common causes

The payer’s file lists other coverage that has since terminated.
A spouse’s or parent’s plan was recorded as primary when the birthday rule or another rule makes it secondary.
Medicare or Medicaid status changed and the commercial plan has not caught up.
The payer received information from a data match that was incorrect.

How to fix it

Call the payer and ask what other coverage it has on file and the effective dates.
Verify the facts with the patient and, if possible, the other insurer’s eligibility system.
Provide the correct information through the payer’s preferred channel, including termination dates or order of benefits.
Ask whether the claim will be reprocessed automatically; if not, resubmit once the update posts.
If the other coverage really is primary, bill that plan first and send this payer its remittance.

For deeper troubleshooting, see eligibility and COB denials.

How to prevent it

Run real-time eligibility before each visit and look for coordination of benefits flags in the response. When a patient reports changed coverage, notify affected payers right away rather than waiting for a denial.

Codes that may appear with N191

OA-22 (This care may be covered by another payer per coordination of benefits.): The payer's records show another payer may be primary; N191 asks the provider to correct those records if they are wrong.
CO-16 (Claim/service lacks information or has submission/billing error(s).): Information is missing or incorrect, and the fix is a direct update with the payer.
CO-109 (Claim/service not covered by this payer/contractor.): The claim is not covered by this payer, which can stem from outdated coverage records.

N197 (The subscriber must update insurance information directly with payer.): The same instruction, but directed at the subscriber rather than the provider.
N155 (Alert: Our records do not indicate that other insurance is on file.): Alert that no other insurance is on file and details should be submitted.
N245 (Incomplete/invalid plan information for other insurance.): Plan information for other insurance on the claim was incomplete or invalid.

N191 FAQ

How do I update insurance information with a payer?

Most payers take updates by phone through provider services, through a provider portal, or on a coordination of benefits form. The method varies, so check the payer's provider manual.

What if the patient says the other coverage ended?

Get proof, such as a termination letter or the other plan's confirmation, and give it to the payer. Some payers still require the member to confirm, in which case N197 may follow.

Do I need to resubmit after updating?

Sometimes the payer reprocesses on its own once records change; other times you must resubmit. Ask when you make the update.

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