Occlusion and stenosis of left carotid artery

This code signifies a narrowing or complete blockage of the left carotid artery, a major blood vessel supplying blood to the brain. This condition can lead to reduced blood flow, increasing the risk of transient ischemic attacks (TIAs) or strokes.

Apply this code when documentation explicitly states occlusion or stenosis affecting the left carotid artery. This includes conditions like atherosclerosis causing narrowing, or a thrombus leading to a complete blockage. Supporting documentation should specify the laterality (left) and the nature of the obstruction.

• Ensure laterality is clearly documented; do not use unspecified codes if left is known.
• Distinguish between occlusion (complete blockage) and stenosis (narrowing) if specified, though this code covers both.
• Consider sequencing this code with codes for associated conditions like atherosclerosis (I70.0-I70.9) or cerebral infarction (I63.-) if present.