Question: Georgia Subscriber Answer: Because the descriptor specifies a medication amount, one unit equals 15 mg. Tocalculate the units, divide the total mg administered by 15. For example, in this case you'll bill with four units of service as your physician injected 60 mg of Toradol. -- Answers to You Be the Coder and Reader Questions were provided by Scott Groudine, MD, an Albany, N.Y., anesthesiologist; and Marvel J. Hammer, RN, CPC, CCS-P, ACS-PM, CHCO, owner of MJH Consulting in Denver.