my scenario: patient is given fentanyl, 50 mcg, IVP and versed, 1mg, IVP @ 0823. a second IVP of both meds (same dosage) @ 1036. I am billing for conscious sedation. Does this constitute 15 minutes plus an additional 8 units of intraservice time, do I need to bill each unit separately (8claim lines) or can I bill one line with 8units and if the meds are given by an RN but the patient is monitored by an MA(attending to the patient) and a physician(performing the procedure), do I bill with cpts 99152/99153, or 99156/99157? (patients are always older then 5yrs) Thanks for any help!