M15M-series (Medicare line-level)Coding & Bundling
M15: Services bundled into primary procedure
Separately billed services were bundled because the payer considers them components of the primary procedure — classic NCCI/inclusive-service logic.
Commonly appears with these denial codes
The denial code gives the category; M15 pinpoints the specific problem. Read them together before touching the claim.
What to do about it
Check NCCI edits: if a bypass modifier (59/X-series) is clinically supported and documented, appeal or rebill with it. Otherwise write off — don't unbundle without support.
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