MA04 Remark Code: Primary Payer Information Missing on a Secondary Claim
Remark code MA04 means the claim was billed as secondary, but the payer cannot consider it because the primary payer's identity or payment information is missing or unreadable. The secondary payer needs to know who the primary was and what it paid or adjusted before calculating its own payment - without that, the claim stalls.
Common Causes
- The primary payer's remittance information (paid amounts, adjustments) was not attached to or transmitted with the secondary claim
- Electronic COB segments populated incorrectly, so the primary payment data did not survive transmission
- A paper primary EOB submitted was illegible or incomplete
- The claim went to the secondary payer before the primary finished processing
- An expected Medicare crossover did not happen, and the claim reached the supplemental payer without Medicare's payment data
How to Fix MA04
- Obtain the primary payer's finalized remittance for the claim and confirm processing is complete
- Resubmit the secondary claim with complete primary payment information - correct COB loops on electronic claims, or a legible copy of the primary EOB on paper
- Verify the primary payer's identity (name, payer ID) is on the claim exactly as the secondary payer expects
- For Medicare supplemental claims, check whether the crossover occurred before submitting directly - a direct submission may need the full Medicare remittance attached
Frequently Asked Questions
MA04 means the secondary payment cannot be considered because the primary payer's identity or payment information was missing or illegible on the claim. The secondary payer needs the primary's adjudication details to calculate what it owes.
Wait for the primary payer to finalize, then resubmit the secondary claim with complete primary payment data - properly populated COB information on electronic claims or a legible primary EOB attached to paper claims.
Related Denial Codes
Related Resources
Claim adjustment reason codes and remittance advice remark codes are standardized code sets maintained by X12. The explanations on this page are written in our own words for educational purposes, based on public CMS and Medicare contractor documentation. Payer policies vary - always confirm handling with the specific payer's guidance and your contracts.