A patient paid a copayment on a mole removal last week and the insurance states the copayment should not have been needed. The medical assistant could: issue a refund to the patient for the copayment amount. establish a positive balance in the account to be used toward the next service. place the copayment amount in the petty cash fund. issue a refund to the patient for the copayment amount or establish a positive balance in the account to be used toward the next service