I have a description of an ILK injection that says, "2 mL of ILK 20mg/mL (40 mg in total). The ILK in our office is either 10 mg/mL or 40 mg/mL. The physician says bill J3301 x 4. So, if the medicine was from the 40 mg vial wouldn’t that just be 1 unit? or 2 units if using 10 mg/mL vial? This is so confusing for me. I appreciate any help and also if anyone has a reliable formula for doing the math to figure this out I would appreciate knowing that too. Thanks.