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N111 Remark Code: No Appeal Right Except Duplicate Issue

N111 means the service on this claim was already included in a claim that was previously billed and adjudicated. There is no appeal right on the payment decision itself; the only issue you can dispute is whether this service really duplicates the earlier one.

Quick facts

Code
N111 (RARC N111)
Status
Active In use since February 28, 2002.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • OA (Other Adjustment): Duplicate denials are commonly reported as other adjustments. The amount was already handled on the earlier claim.
  • CO (Contractual Obligation): Some payers use CO for the duplicate; either way the provider should not bill the patient for it.
Official description
No appeal right except duplicate claim/service issue. This service was included in a claim that has been previously billed and adjudicated.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N111 means

N111 narrows your options. The payer found that the service on this claim was already part of a claim it had processed. Because the service was already decided, the payer will not reconsider payment through this claim. The single exception: you can challenge the duplicate finding if the two services were actually distinct.

It usually accompanies CARC 18 or CARC B13.

Common causes

  • The claim was resubmitted because payment seemed slow, before checking claim status.
  • A corrected claim was sent as a new original instead of a replacement.
  • The same service was billed by two systems, for example after a software conversion.
  • Two distinct services on the same day looked identical because a modifier or unit count was missing.

What to do

  1. Locate the earlier claim and its remittance.
  2. Compare the details. If the services are the same, no further action is needed on this claim; any dispute belongs to the original.
  3. If they differ, appeal the duplicate finding with records showing two separate services, or send a corrected claim with the distinguishing modifier as the payer instructs.
  4. If you meant to correct the first claim, send a replacement with resubmission code 7 in CMS-1500 box 22 and the original claim number.

How to prevent it

Check claim status before rebilling, and use replacement claims for corrections. The duplicate claims guide covers the most common duplicate triggers and how to stop them.

Codes that may appear with N111

  • OA-18 (Exact duplicate claim/service (Use only with Group Code OA except where state workers' compensation regulations requires CO)): Exact duplicate claim or service; N111 adds that only the duplicate question can be appealed.
  • CO-B13 (Previously paid.): Previously paid; payment may have been made on an earlier claim.
  • N142 (The original claim was denied.): Tells you to submit a new claim, not a replacement, when the original was denied.
  • MA130 (Your claim contains incomplete and/or invalid information, and no appeal rights are afforded because the claim is unprocessable.): Another no-appeal remark, used for unprocessable claims that must be corrected and resubmitted.
  • M86 (Service denied because payment already made for same/similar procedure within set time frame.): Denies a service because payment was already made for the same or similar procedure within a time frame.

N111 FAQ

How do I check whether it is really a duplicate?

Find the earlier claim and compare patient, date of service, procedure, modifiers, units, and provider. If any of those legitimately differ, it may not be a duplicate.

What if the first claim was wrong and I wanted to fix it?

Send a replacement claim (frequency code 7) referencing the original claim number instead of a new claim. A new claim for the same service looks like a duplicate.

Can I appeal the amount paid on the earlier claim?

That dispute belongs to the earlier claim, under its own appeal rights and deadlines, not to the claim carrying N111.