M77M-series (Medicare line-level)Missing Information
M77: Place of service missing or wrong
The place-of-service code is missing, invalid, or inconsistent with the service billed — a telehealth visit with an office POS is a classic trigger.
Commonly appears with these denial codes
The denial code gives the category; M77 pinpoints the specific problem. Read them together before touching the claim.
What to do about it
Match the POS code to where the service actually occurred (including telehealth POS 02/10 rules) and resubmit a corrected claim.
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