MA99
What This Code Means
The claim is missing, incomplete, or has an invalid Medigap information.
Common Causes
- Another payer is primary and wasn't billed first
- COB information on file with the payer is outdated
- Primary payer's EOB not included with the secondary claim
How to Resolve or Appeal
- Confirm the correct primary/secondary order with the patient and payer
- Bill the primary payer first if not already done
- Attach the primary payer's EOB/835 information when billing secondary
More Denial Codes to Check
Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.