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Medicare Secondary Payer (MSP) Overpayments

The MSP Overpayments area is responsible for all overpayment activities associated with MSP related debt and credit balances. This department is available to assist you with any questions or concerns you may have regarding the repayment of monies owed to the Medicare Program. Below you will find our contact information and a listing of the typical situations handled by our department. Select the Forms tab from the top navigation, then Overpayments/Medicare Secondary Payer (MSP), to find an overview of the forms that are to be used for the following situations:

  • MSP voluntary refunds
  • MSP overpayment notifications
  • MSP immediate recoupment requests
  • MSP general inquiries for overpayments
  • Credit Balance Inquiries

Telephone Number

(866) 734-1521
Hours of operation: M-F 9:00 am to 1:00 pm CT

Medicare Secondary Payer Addresses

Physical Address:

Medicare J5 and J5 National
Medicare Secondary Payer
1717 West Broadway
Madison, WI 53713

Addresses for:
  • MSP Checks
  • MSP Voluntary Refund Checks Accompanied by a MSP Voluntary Refund Form
  • MSP Checks for Demanded Overpayments Accompanied by the Demand Letter and Chart
J5 MAC J5 National
WPS Medicare Part A
MSP Refund
P.O. Box 8899
Marion, IL 62959-0899
WPS Medicare Part A
MSP Refund
P.O. Box 8910
Marion, IL 62959-0900
Addresses for:
  • MSP General Inquiries
  • MSP Overpayment Notification Form
  • MSP Immediate Recoupment Form
IA KS MO NE National
WPS Medicare Part A
MSP Inquiry
P.O. Box 7665
Madison, WI 53707-7665
WPS Medicare Part A
MSP Inquiry
P.O. Box 7576
Madison, WI 53707-7576
WPS Medicare Part A
MSP Inquiry
P.O. Box 8890
Madison, WI 53708-8890
WPS Medicare Part A
MSP Inquiry
P.O. Box 8799
Madison, WI 53708-8799
WPS Medicare Part A
MSP Inquiry
P.O. Box 7861
Madison, WI 53707-7861

Medicare Secondary Payer Information

The MSP area works to answer claims-related questions regarding:

  • Medicare Secondary Payer Condition Codes (08, 09, 10, 11, D7, D8, D9)
  • Medicare Secondary Payer Codes (D, L, E, G, A, B, H)
  • Medicare Secondary Payer Value Codes (14, 47, 15, 43, 12, 13, 41)
  • Claims with reject codes that range from 33000 - 34999

Attorney and Insurer Education

Credit Balances

Post Settlement


Find MSP forms including Form CMS-838 (Credit Balance Form) on the Medicare Secondary Payer (MSP) Forms page.

Frequently Asked Questions (FAQs)

Find FAQs concerning MSP Overpayments on the Medicare Secondary Payer (MSP) Overpayments FAQs page.