N104 remark code

Remittance advice remark code N104. Remark codes add detail to the reason code on the same claim line.

Wrong Medicare contractor

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 N104 means

This Medicare contractor does not handle the claim because it falls outside its jurisdiction, so it must go to the right one.

N104 is a Medicare routing remark. The contractor that received the claim is not the one responsible for that provider, place of service or item, and CMS publishes which contractor handles what.

It explains why the claim was not processed rather than a payment decision, and usually comes with a reason code saying the claim was sent to the wrong place.

Common causes

• The claim was sent to the contractor for a different state or region than where the service was performed.
• A durable medical equipment claim went to a Part B contractor, or the reverse.
• The provider's enrollment is with a different jurisdiction than the claim was sent to.

What to do next

1. Find the correct contractor for the service location and claim type on the CMS website.
2. Check your clearinghouse payer ID routing for this claim type.
3. Submit the claim to the correct contractor as a new claim, watching the filing deadline.

Related codes

• N418 (remark code) Claim sent to the wrong place
• 109 (reason code) Not covered by this payer, send elsewhere
• N34 (remark code) Wrong claim form or format