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N418 Remark Code: Misrouted Claim

N418 means the claim was misrouted. It reached a payer, processing unit, or address that does not handle it, and the payer is directing you to its claim submission instructions so you can send the claim to the correct destination.

Quick facts

Code
N418 (RARC N418)
Status
Active In use since August 1, 2007.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim was not processed because of where it was sent. The provider is responsible for rerouting it, and the patient should not be billed.
  • OA (Other Adjustment): Some payers report the misrouted claim as an other adjustment. The amount remains open until the claim is filed with the right entity.
Official description
Misrouted claim. See the payer's claim submission instructions.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N418 means

N418 is the payer telling you the claim landed in the wrong place. The entity that received it does not process this type of claim for this member, so it is pointing you back to its claim submission instructions. Nothing on the remittance is a judgment on the care itself.

It usually pairs with CARC 109 (not covered by this payer, send to the correct one) or B11 (transferred to the proper payer).

Common causes

  • Wrong payer ID. The clearinghouse payer ID matched the carrier’s name but not the specific plan, product, or region.
  • Carved-out benefits. Behavioral health, vision, lab, or pharmacy benefits are handled by a separate administrator, and the claim went to the medical plan.
  • Managed care vs. fee-for-service. A Medicaid or Medicare Advantage member’s claim was sent to the traditional program, or the reverse.
  • Regional or jurisdiction routing. The payer processes claims by state or service location, and the claim went to the wrong unit.
  • Old address on a paper claim after the payer moved its claims processing.

How to fix it

  1. Read the member ID card front and back for the claims address and payer ID, and check whether a separate administrator handles this benefit.
  2. Run an eligibility check to confirm the active plan and any carve-outs.
  3. Check the payer’s provider manual or claim submission page for the correct routing.
  4. Update the payer record in your billing system so future claims route correctly.
  5. Send the claim to the correct destination as a new claim. Keep the N418 remittance as evidence of your original submission date in case timely filing becomes an issue; see timely filing denials.

How to prevent it

Scan ID cards at every visit and map each plan to a specific payer ID, not just a carrier name. Flag plans with carved-out benefits in your system so claims for those services route to the right administrator automatically. Routing problems are a classic front-end issue, covered further in claim rejection vs denial.

Codes that may appear with N418

  • CO-109 (Claim/service not covered by this payer/contractor.): The claim is not covered by this payer or contractor and must be sent to the correct one.
  • CO-B11 (The claim/service has been transferred to the proper payer/processor for processing.): The claim was transferred to the proper payer; N418 adds that it was misrouted in the first place.
  • CO-16 (Claim/service lacks information or has submission/billing error(s).): Used by some payers to flag the routing error as a submission problem.
  • N407 (You are not an approved submitter for this transmission format.): The submitter is not approved for the transmission format, a setup problem rather than a routing one.
  • OA-22 (This care may be covered by another payer per coordination of benefits.): Another payer may be responsible under coordination of benefits, which is a coverage question, not a routing one.
  • N438 (This jurisdiction only accepts paper claims.): The jurisdiction only accepts paper claims, so an electronic submission went to the wrong channel.

N418 FAQ

Will the payer forward the claim for me?

Sometimes. If the remittance also shows CARC B11, the claim was transferred. With N418 alone, assume you need to resubmit to the correct destination yourself.

Does a misrouted claim stop the timely filing clock?

Generally not. Proof that you submitted on time to the wrong entity may help on appeal with some payers, but do not rely on it. Refile promptly.

How do I find the correct payer ID?

Use the payer ID printed on the member's ID card or listed in the payer's provider manual, and confirm it with your clearinghouse's payer list.