Patients Receiving New Medicare Numbers

When a patient reports their Medicare card lost or stolen, they will receive a new Medicare Beneficiary Identifier (MBI) number. When a patient receives a new MBI number, providers must immediately switch to billing with the new MBI. Billing with the old MBI may result in receiving the below CARC and RARC rejection codes:

  • CO16: Claim/Service lack information or has submission/billing error(s).
  • N382: Missing/Incomplete/Invalid patient identifier

If you receive a denial with the above remark codes, please verify the patient's MBI using the NMP MBI Lookup Tool.

Resources:

Denial Code Resolution

 

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