Invalid Medicare Beneficiary Identifier (MBI)

CARC/RARC Description
CO-16 Claim/service lacks information or has submission/billing error(s). Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service)
N382 Missing/incomplete/invalid patient identifier.
N704 Alert: You may not appeal this decision but can resubmit this claim/service with corrected information if warranted.


Common Reasons for Message

  • Patient Medicare Beneficiary Identifier (MBI) number is invalid or was not submitted.

Next Step

Claim Submission Tips

  • Obtain patient's Medicare Beneficiary Identifier (MBI) number directly from their most current Medicare card
    • Keep a copy on file
  • If patient sees a problem or has an error on his/her Medicare card, they must contact Social Security Administration (SSA) at 800-772-1213 to make necessary correction(s)


Last Updated Dec 09 , 2023