M20M-series (Medicare line-level)Missing Information
M20: HCPCS code missing or invalid
The HCPCS code is absent, incomplete, or not valid for the date of service. Common after quarterly HCPCS updates when deleted codes linger in charge masters.
Commonly appears with these denial codes
The denial code gives the category; M20 pinpoints the specific problem. Read them together before touching the claim.
What to do about it
Verify the code against the HCPCS file effective on the date of service, update the charge master, and resubmit a corrected claim.
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