It's just an extra step we're taking to verify the returns we process and make sure refunds go to the right person. View refund and overpayment credit information.System IRMS User Guide for Localities. In order for an overpayment refund to be processed in a timely manner, please submit a completed form with all refund checks and supporting documentation. Many times when a third-party payer mistakenly pays a dental provider, the payer will request a refund of the overpaid amount. If we have identified an overpayment and request a refund, please mail the check along with a copy of the overpayment request letter we sent you. Schools must refund tuition and fee payments to students in accordance with their established refund policies, so that the students can resolve over-payments.