Looking for some clarification. Our MAC WPS states the beneficiary can only be billed for the difference between the standard fee for the preventive visit (ex: 99397) and the amount that Medicare will cover for the carve outs (G0101, Q0091) which I'm understanding to mean the Medicare allowable, not the standard fee charged. I have seen just the opposite being practiced meaning standard charge for the carve outs subtracted from standard charge for the preventive visit. Using the allowable would leave the patient owing a much larger amount. Could someone please clarify on this subject?