N122N-series (general use)Coding & Bundling
N122: Add-on code billed without primary
Add-on CPT codes can't stand alone — the required primary procedure code isn't on the claim (or was denied).
Commonly appears with these denial codes
The denial code gives the category; N122 pinpoints the specific problem. Read them together before touching the claim.
What to do about it
Bill the add-on with its parent primary code on the same claim. If the primary denied, resolve that first — the add-on follows it.
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