M79M-series (Medicare line-level)Missing Information
M79: Charge amount missing or invalid
A line item is missing its charge, has a zero/illegible amount, or the charge fails basic validation.
Commonly appears with these denial codes
The denial code gives the category; M79 pinpoints the specific problem. Read them together before touching the claim.
What to do about it
Populate a valid charge on every line and rebill. Zero-charge lines need the payer's specific convention (some require $0.01 or an informational modifier).
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