I have recently taken on a rheumatologist to do billing for. He does many bursa injections so I am using 20600, 20605 and 20610. He injects Depomedrol 80 mg and Xylocaine. I would like to be able to get him reimbursed for the Depomedrol J1040 but he uses a multidose vial. He states it is a 15 cc vial but he may only use 1/4 1/3 1/5 of the vial on one pt. How do I properly bill quantity used and billed amount to the insurances?