Ask Dr. Z

What do you code if physician selectively engaged in right and left common carotids and said this: "The right common carotid artery injection demonstrates normal antegrade flow into the external and internal carotid arteries with normal filling of the external carotid artery branches. Course and caliber of the cervical portion of the right internal carotid artery is unremarkable." Then he also says he engaged in right and left internals, right and left subclavians, and right and left vertebrals. He engaged in all these selectively.