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Revised: March 22, 2018

Important Information to Include When Refunding an Overpayment

To expedite the posting of checks sent to CGS in response to an overpayment, ensure the following information is included:

  • Patient's Medicare Number
  • Date(s) of service
  • Claim number (DCN or CCN)
  • Reason for refund
  • Refund amount
  • For refunds that are MSP-related, include the EOB or the payment allowed and paid by the primary insurer

When sending a check to cover a large number of adjustments, CGS recommends sending the required information on a CD in Microsoft Excel.  The CD and check can be mailed to one of the following lockboxes:

Part A Kentucky
PO Box 957582
St. Louis, MO 63195
Home Health and Hospice
PO Box 957124
St. Louis, MO 63195
Part B Kentucky
PO Box 957065
St. Louis, MO 63195
Part A Ohio
PO Box 957635
St. Louis, MO 63195
  Part B Ohio
PO Box 957352
St. Louis, MO 63195

Note: If you are unable to send the information via a CD, it can be sent in an encrypted email to one of the following individuals:

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