In most cases, overpayments must be paid back even if you have already spent the money and in some cases, a penalty may be applied. This webpage defines the two situations in which overpayment occurs MSP (Medicare Secondary Payer) Overpayments and Non MSP Overpayments.Please download the form, complete each field and print. Include the form with your refund so we can properly apply the refund and record the receipt. On Question 2, check the first box. Also write on the form: "I want all overpayments on my record to be waived, even the amounts you have already collected." We will send you a notice explaining the overpayment and asking for a full refund within 30 days.