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Patient already had a CFA puncture for fem/pop angioplasty, and then the physician's documentation states: "At this point we prepped the patient's left foot and punctured the posterior tibial artery under US guidance. Again a wire and a catheter were inserted and angiography confirmed location. Following this 100 mcg of nitroglycerin was injected through the catheter every 15 minutes. We were able to advance a wire and a catheter through the TPT and into the popliteal artery. We then used a micro-snare and were able to snare the wire coming from the posterior tibial puncture from a catheter inserted from the common femoral puncture." I'm really at a loss on how to code what is documented above. Any help would be appreciated.