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I am trying to determine coding for excision of previously placed carotid bypass and placement of another carotid-ipsilateral carotid bypass. Does this qualify for code 35501 or repair blood vessel code 35231, or is this unlisted procedure? "Procedure Description: We carefully dissected the common carotid artery bypass graft and then extended the dissection more distally and identified internal and external carotid arteries. These were encircled with vessel loops and clamped in order, internal, external, and common carotid. The graft was completely excised, and the proximal end of the greater saphenous vein was spatulated, and an end-to-end anastomosis between the vein and the very distal common carotid artery at the bifurcation was carried out using 6-0 prolene suture. Following completion of the anastomosis, the proximal common carotid artery was spatulated, the vein was cut to appropriate length and spatulated, and an end-to-end anastomosis was then created using 6-0 prolene suture."