Occlusion and stenosis of left middle cerebral artery

This code signifies a narrowing or complete blockage of the left middle cerebral artery, a major blood vessel supplying blood to a large part of the brain. This condition can lead to reduced blood flow (ischemia) and potentially a stroke if not adequately compensated.

This code is appropriate when diagnostic imaging (e.g., CTA, MRA, cerebral angiography) confirms an occlusion or significant stenosis specifically affecting the left middle cerebral artery. Documentation should clearly specify the vessel and the nature of the obstruction.

• Ensure the laterality (left) and the specific vessel (middle cerebral artery) are explicitly documented.
• Distinguish between occlusion (complete blockage) and stenosis (narrowing); this code covers both.
• If an ischemic stroke resulted from this occlusion/stenosis, sequence the stroke code first, followed by this code as an underlying cause.