Cerebral atherosclerosis

This code represents the hardening and narrowing of the arteries supplying blood to the brain due to plaque buildup. This atherosclerotic process can lead to reduced cerebral blood flow, increasing the risk of cerebrovascular events. It signifies a chronic, progressive condition affecting the cerebral vasculature.

Use this code when documentation explicitly states "cerebral atherosclerosis" or "atherosclerosis of cerebral arteries." It is appropriate for patients diagnosed with this condition, whether symptomatic or asymptomatic, and can be a contributing factor to other cerebrovascular diseases. Supporting documentation includes physician notes, imaging reports (e.g., CTA, MRA showing atherosclerotic changes in cerebral vessels), and pathology reports.

• Do not use this code for atherosclerosis affecting other arterial systems (e.g., carotid, coronary); use more specific codes.
• If cerebral atherosclerosis is documented with cerebral infarction, sequence the cerebral infarction code first, followed by this code as an associated condition.
• Ensure documentation clearly specifies "cerebral" to differentiate from generalized or unspecified atherosclerosis.