N522 remark code

Remittance advice remark code N522. Remark codes add detail to the reason code on the same claim line.

Crossover copy already on file

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 N522 means

You billed this claim directly, but the payer already has it, or will get it, through the automatic crossover from the primary.

Many secondary claims are forwarded automatically by the primary payer, called a crossover. N522 means you also sent the claim directly, and the payer already has the crossover version.

It usually explains duplicate reason code 18. Follow the crossover claim rather than the duplicate.

Common causes

• The provider billed the secondary payer directly after the primary already crossed it over.
• The crossover arrived first and the direct claim was treated as a copy.
• Billing system rules send secondary claims automatically even for crossover patients.

What to do next

1. Look up the crossover claim's status with the secondary payer.
2. Post the duplicate denial as informational and do not adjust the balance on it.
3. Set your system to wait for the crossover before billing the secondary directly.

Related codes

• 18 (reason code) Exact duplicate claim or service
• N4 (remark code) Prior payer EOB missing or invalid
• N479 (remark code) Other payer EOB missing for COB