Dear Connie,
You need more than a bill. You need the EOB (explanation of benefits) that your provider received from your insurance company. It shows what they charged, what the allowable charges are, what they were paid, and the disposition of any unpaid charges. The EOB might even show that according to the doctors' contract, they are not allowed to balance bill you, in which case you are entitiled to a full refund. If you were charged a deductible, or a service was rejected, there will be an explanation. All of this will help you figure out if there was a correctable error which can eliminate the charge to you. The doctor's office should be able to provide you with a copy of the EOB, but so should your insurance company. Many insurance companies send statements as a matter of course, but since they are not bills, many patients just dispose of them rather than trying to figure them out.