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Medicare is Secondary Payer - JF Part B

Medicare is Secondary Payer

CARC/RARC Description
CO-16 Claim/service lacks information or has submission/billing error(s) which is needed for adjudication.
MA04 Secondary payment cannot be considered without the identity of or payment information from the primary payer. The information was either not reported or was illegible.


Common Reasons for Message

  • Incorrect primary payer type was submitted on an electronic claim
  • A claim has been submitted as Medicare secondary and national file shows Medicare is primary

Next Step

  • Verify whether Medicare is primary or secondary
  • Claim may be resubmitted with corrected information, or the MSP type can be corrected via a self-service reopening:
    • If Medicare is secondary, verify correct primary insurance type was submitted in loop 2000B SBR02
    • If Medicare is primary, verify no MSP information was billed on claim

Claim Submission Tips


Last Updated Tue, 06 Dec 2022 18:49:10 +0000