MA30MA-series (Medicare alerts & claim-level)Missing Information
MA30: Type of bill missing or invalid
Institutional claims only: the type-of-bill code (form locator 4) is missing or invalid for the services billed.
Commonly appears with these denial codes
The denial code gives the category; MA30 pinpoints the specific problem. Read them together before touching the claim.
What to do about it
Correct the 3-digit TOB (facility type, bill classification, frequency) and resubmit — frequency digit errors are common on corrected claims.
OakClaim fixes root causes, not just claims.
Free billing audit shows which remark codes keep recurring in your AR — and what they're costing you.