MA63MA-series (Medicare alerts & claim-level)Missing Information
MA63: Principal diagnosis missing or invalid
The principal diagnosis is missing or invalid — institutional claims require a valid principal diagnosis that justifies the admission or visit.
Commonly appears with these denial codes
The denial code gives the category; MA63 pinpoints the specific problem. Read them together before touching the claim.
What to do about it
Assign a valid principal diagnosis per coding guidelines (the condition chiefly responsible for the encounter) and resubmit.
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