N657N-series (general use)Coding & Bundling
N657: Rebill with the appropriate code
The payer wants these services billed under a different, more appropriate code — often unlisted codes billed where a specific code exists.
Commonly appears with these denial codes
The denial code gives the category; N657 pinpoints the specific problem. Read them together before touching the claim.
What to do about it
Identify the code the payer expects (policy bulletins usually say), recode, and resubmit rather than appealing.
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