VA Occlusion w/ Stroke...

Hello! I am hoping someone can help clarify the coding rules for me for this scenario.

Cerebral angiogram impresssion states "complete occlusion at the origin of the left vertebral artery with nonvisualization of the vessel extending to the C4 level." The patient does have an acute cerebellar infarct per MRI report. For this DX, I know to code 433.21, vertebral artery occlusion with stroke.

However, the angiogram also finds "moderate stenosis at the origin of the right vertebral artery, which is suggestive of underlying atherosclerotic disease. This is not flow limiting, and there is adequate supply to the posterior circulation." Is it acceptable to also code 433.20, vertebral artery stenosis without evidence of stroke (since this is not flow limiting and not a contributor to the acute stroke) on the same claim as 433.21?

433.30/1 is for multiple and bilateral, but I'm not sure if this code is appropriate since only one side (L) is contributing to the stroke.

TIA!

VA Occlusion w/ Stroke...