Ask Dr. Z

We are looking to get clarification on the furthest selectivity principle and how it applies to contralateral venous sinuses when selection has been made by advancing straight through the torcula from one side to the other, rather than pulling back and entering the other side through the internal jugular. Our case example is this: Right femoral access, with selections in: right internal jugular, advancing to right sigmoid sinus, advancing to right transverse sinus, advancing through torcular herophili, advancing to left transverse sinus, advancing to left sigmoid sinus, advancing to left internal jugular (with angiography taken at each placement). Would code assignment be one unit of 36012 due to the furthest selectivity principle? Also for the angiography S&I, are we only able to code 75860 x 2?