To my understanding, insurance companies post fee schedules, and the things that change reimbursement in those schedules are location/POS, participation in the insurance, and certain modifiers like 26, TC, and 80. So far as I know the taxonomy code of the doctor has nothing to do with the fee schedule reimbursement. It will change the copay, though, depending on the insurance/policy. For instance, some policies have a $20 copay for a PCP, and $40 for a specialist.