Occlusion and stenosis of bilateral vertebral arteries

This diagnosis code signifies a narrowing or complete blockage affecting both the right and left vertebral arteries. These arteries are crucial for supplying blood to the posterior part of the brain, including the brainstem and cerebellum. Impaired blood flow due to this condition can lead to various neurological symptoms.

This code is appropriate when diagnostic imaging (e.g., MRA, CTA, Doppler ultrasound) confirms significant occlusion or stenosis in both vertebral arteries. Clinical documentation should clearly specify the bilateral involvement of these vessels. It is used for patients presenting with symptoms such as vertigo, ataxia, diplopia, or transient ischemic attacks (TIAs) attributable to vertebrobasilar insufficiency.

• Ensure documentation explicitly states "bilateral" involvement of the vertebral arteries; otherwise, a unilateral code may be more appropriate.
• Distinguish from carotid artery stenosis; these are distinct vascular territories.
• Consider sequencing this code as a primary diagnosis if it is the main reason for the encounter, or as a secondary diagnosis if it is an underlying condition impacting the patient's care.