N822 remark code

Remittance advice remark code N822. Remark codes add detail to the reason code on the same claim line.

Procedure modifier missing

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 N822 means

The service needs one or more modifiers to be processed correctly, and none were reported on the line.

N822 means the payer expected a modifier for this code in this situation, for example to show laterality, a professional or technical component, or a distinct service. Without it the payer cannot decide how to process the line.

It typically adds detail to reason code 16. Adding the right modifier on a corrected claim usually resolves it.

Common causes

• A code that requires a side, component or other modifier was billed without one.
• A payer specific modifier requirement was missed.
• The modifier was dropped during claim scrubbing or by an interface.

What to do next

1. Check the payer's policy for which modifier the code needs.
2. Confirm the documentation supports the modifier you plan to add.
3. Submit a corrected claim with the modifier on the right line.
4. Find out whether the modifier was lost between the charge entry and the claim.

Related codes

• N823 (remark code) Procedure modifier invalid or incomplete
• N519 (remark code) Invalid modifier combination
• 4 (reason code) Procedure code and modifier do not match