M80M-series (Medicare line-level)Coding & Bundling
M80: Not covered same session as prior service
The service isn't payable because it occurred in the same session/date as another already-processed service that includes it.
Commonly appears with these denial codes
The denial code gives the category; M80 pinpoints the specific problem. Read them together before touching the claim.
What to do about it
Review what already paid for that date. If the services were distinct (different site, session, or problem), append the appropriate modifier and appeal with notes.
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