To facilitate prompt and accurate credit of unsolicited monies or voluntary refunds to Medicare, a Return of Monies form has been developed. Please use the Return of Monies form (8322) for Part B if you receive a Medicare payment in error. This form should be completed in its entirety and accompany every unsolicited/voluntary refund so that receipt of a check can be properly recorded and applied. Missing information on the form may result in a delay in applying the check, due to Medicare needing to develop for the information. Source: Highmark Medicare Services - MAC for Delaware, District of Columbia, Maryland, New Jersey, Pennsylvania.