Occlusion and stenosis of left anterior cerebral artery

This diagnosis code signifies a narrowing or complete blockage of the left anterior cerebral artery, a major blood vessel supplying blood to the frontal lobes of the brain. This condition can lead to reduced blood flow (ischemia) and potentially a stroke if not adequately treated.

This code is appropriate when documentation explicitly states occlusion or stenosis affecting the left anterior cerebral artery. Supporting documentation typically includes imaging reports (e.g., MRI, CT angiography, cerebral angiography) confirming the location and nature of the vascular compromise, along with physician notes detailing the clinical presentation.

• Always specify laterality (left, right, bilateral) when documented for cerebral artery conditions.
• Distinguish between occlusion (complete blockage) and stenosis (narrowing) based on provider documentation.
• If an infarction (stroke) has occurred as a result, a secondary code for the specific type of cerebral infarction (e.g., I63.x) should also be assigned, following the sequencing guidelines for cerebrovascular disease.