Medicare Secondary Payer (MSP) Payer Type Corrections via Noridian Medicare Portal (NMP)

Do you know if your facility, practice or billing service is utilizing the Noridian Medicare Portal (NMP) to view the Eligibility section of your patient's payer type/value code when billing Medicare as a secondary payer? For example, billing Disability (43) when actual MSP/Payer type was Liability (47).

Denial messages related to incorrect payer type or value codes includes the following:

  • Secondary payment cannot be made, because primary insurer information is missing or incomplete.
  • RARC code: MA04 (Secondary payment cannot be considered without the identity of or payment information from the primary payer.)
  • CARC code: CO-16 (Claim/service lacks information or has submission/billing error{s}.)


  • Fix these errors quickly through the NMP, under Reopenings, and listen to the Education on Demand recording found under MSP Payer type Reopening through the portal.
  • Read more under Browse by Topic, Medicare Secondary Payer (MSP) for definitions, payer types, billing MSP electronically, etc.
  • Noridian encourages providers to utilize the Noridian Medicare Portal (NMP).

Last Updated May 15, 2020