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I am coding the below with 3D (73677), and I am clashing with others that code it as 76377 x’s. I’ve done extensive research trying to find documentation that 76377 is per field not per artery.

"Right vertebral artery intracranial circulation was obtained with 3D rotational angiography and cone beam head CT of the right vertebral artery intracranial circulation were obtained and processed on a separate workstation and saved to imaging system. The catheter was then withdrawn into innominate artery.

Left internal carotid artery was selectively catheterized over a glidewire. AP, lateral, transorbital oblique, and Schuller's projections of the left internal carotid artery intracranial circulation were obtained. 3D rotational angiography and cone beam head CT of the left internal carotid artery intracranial circulation was obtained and processed on a separate workstation and saved to imaging system."