I am getting differing opinions on this and am getting more confused. The right subclavian was engaged and angiography performed with runoff into the carotid and vertebral arteries. Angled glidewire advanced to the right internal carotid with cerebral angiography. I had 36218 for the internal rt carotid with 75665, 75676, 75710 and 75685. Someone else told me to code 36218 for the right subclavian, then 36216 for the right common carotid, plus the S&I codes I already listed. I just am not understanding the reason for this.