bypass question re: 35685 synthetic vs bovine

julrey

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My question is in regards to cpt code 35685. If a vein patch is being used for a bovine fem-pop artery bypass graft (35656) is that considered a synthetic conduit where I could use 35685 or would I have to use 37799 if bovine is not considered a synthetic conduit?
Thanks so much for your thoughts
 
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