We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error. If they actually overpaid you, yes you must pay them back.In reporting, use property types that reflect the nature of the account. Send a letter to the insurance company making them aware an erroneous overpayment was made. You should be able to just ask them. As Jon Allcox pointed out, it really depends on whether both you and the insurer agree you have been overcharged. 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. In order to recover an overpayment, a carrier must notify the provider within 180 days of the date the provider received the overpayment.