Compare the receipt from the visit against your Medicare Summary Notice or the statement from your insurance. Different numbers? Money collected from you that you did not owe has to come back to you, but most offices park it as an account credit and wait. One letter: "Please refund the overpayment of $__ by check within 30 days," with the receipt and the notice attached, by certified mail. Say "check," not "credit." A credit is their money until you spend it there.
Paid at the visit and the notice says less? Upload the receipt and the notice. BillFighter writes the refund letter, ready for certified mail.
Check your bill — freeThe check is free. The letter is the paid part: you print and mail it yourself, or we send it by certified mail for you. No account needed to start.
This is the general rule, in plain words. BillFighter is not a law firm and does not give legal advice. If you have been served with court papers, that is the day for a lawyer or legal aid.