Amaurosis fugax

This code represents a temporary, painless loss of vision in one eye, often described as a "curtain" or "shade" coming down over the eye. It is typically caused by a transient ischemic attack (TIA) affecting the ophthalmic artery or its branches, indicating a potential underlying cerebrovascular or cardiovascular issue.

Use this code when documentation clearly indicates a patient experienced a monocular, transient vision loss consistent with amaurosis fugax. This diagnosis often prompts further investigation for carotid artery disease, cardiac emboli, or other sources of transient cerebral ischemia.

• Always look for documentation of the underlying cause of the amaurosis fugax, such as carotid artery stenosis (I65.2-), and code it as a secondary diagnosis.
• Do not confuse with permanent vision loss or other types of transient visual disturbances like scintillating scotomas (often associated with migraine).
• Ensure the documentation specifies "transient" or "temporary" vision loss to support this diagnosis.