Open coronary artery bypass graft surgery

A patient undergoes open coronary artery bypass graft surgery:

left internal mammary artery to LAD, left radial artery (LRA)

graft from the aorta to the posterior descending artery (PDA),

and left greater saphenous vein graft from the aorta sequential

to the diagonal to the obtuse marginal. Both grafts are

harvested using a percutaneous endoscopic approach.

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A.How many codes are required to represent this procedure?

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B.How many root operations?

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C.What are the codes?