N1 remark code

Remittance advice remark code N1. Remark codes add detail to the reason code on the same claim line.

Appeal rights notice

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 N1 means

An alert telling you the decision on this claim can be appealed in writing, within the deadlines set by the contract or plan.

N1 is an informational alert, not a reason for nonpayment. It rides along with an adjustment to let you know that appeal rights exist and that the payer's own rules, contract terms or applicable law set the deadline and format.

The actual reason for the adjustment is the claim adjustment reason code on the same line or claim. Read that first, then decide whether an appeal is worth filing.

Common causes

• The payer attaches appeal rights language to most denials and reductions as a standard notice.
• A claim or line was denied or reduced and the payer is required to tell you how to dispute it.
• The payer's remittance setup adds N1 to every adjusted claim regardless of the reason.

What to do next

1. Read the reason code on the same line to understand what was actually adjusted.
2. Look up the payer's appeal deadline and required forms on its provider website or in your contract.
3. Decide whether a corrected claim would fix the issue faster than a written appeal.
4. Log the appeal deadline in your follow-up system so it is not missed.

Related codes

• N211 (remark code) Decision cannot be appealed
• N704 (remark code) No appeal, but can be corrected
• N130 (remark code) Check plan benefits for restrictions