Overpayments. To receive important letters about overpayment recovery waivers, please ensure your mailing address is updated in your IDES account. The client will have 30 days from the date of the Overpayment letter to submit the request and supporting documents.Create an Overpayment Work Item - Process Steps: Scroll to the Work Item Details section of the page. Select the correct Source from the drop-down list. To do this, fill out the Request for Change in Overpayment Recovery Rate form. Click here to search for any overpayments on your PIN. Please call 1-800-772-1772 or your local field office and we may be able to process your waiver request quickly over the phone. When you identify a Medicare overpayment, use the Overpayment Refund Formto submit the voluntary refund.