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Patient has AV fistula, and physician documents medical rationale for advancing the fistula beyond the anastomosis (i.e., steal/embolus). I am comfortable in the concept that code 36147 includes imaging of the adjacent fistula. However, the question came up that if the physician evaluates only one other artery, is that sufficient for code 75710? Or does it have to be multiple arteries? It's a weird question, but the physician has it in his head that to qualify for 75710 beyond 36147 there should be at least three vessels visualized, but that seems to imply that there is a minimum to use the code. Thanks for any insight.