N418 remark code

Remittance advice remark code N418. Remark codes add detail to the reason code on the same claim line.

Claim sent to the wrong place

Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated Nov 11, 2026.

What N418 means

The claim was misrouted and needs to be sent according to the payer's submission instructions.

N418 means the claim reached the wrong payer, plan, address or electronic payer ID. The payer that received it is not the one that should process it, often because a plan uses a separate administrator, a delegated group or a different payer ID for certain products.

It explains why the claim was not processed and normally means a new submission to the right place.

Common causes

• The plan is administered by a third party or delegated medical group with its own payer ID.
• The claim used a general payer ID when the product line needs a specific one.
• A carve-out vendor handles this type of service for the plan.

What to do next

1. Check the patient's card for the correct claims address or payer ID.
2. Confirm the routing with the payer or clearinghouse payer list.
3. Submit the claim to the right destination and keep proof of the first submission date.
4. Update the insurance plan setup in your system so future claims route correctly.

Related codes

• N104 (remark code) Wrong Medicare contractor
• N34 (remark code) Wrong claim form or format
• 109 (reason code) Not covered by this payer, send elsewhere