Acute cerebrovascular insufficiency

This code represents a sudden, temporary reduction in blood flow to the brain, leading to neurological symptoms. It signifies a transient state of cerebral hypoperfusion without evidence of infarction. This condition is often a precursor to more severe cerebrovascular events.

Use this code for patients presenting with acute neurological deficits (e.g., transient weakness, speech disturbance, visual changes) that resolve completely within 24 hours, consistent with a transient ischemic attack (TIA). Documentation should clearly state "acute cerebrovascular insufficiency" or "TIA" and confirm the transient nature of symptoms without permanent brain damage.

• Do not use this code if imaging (CT, MRI) reveals evidence of cerebral infarction; instead, code to the appropriate cerebral infarction code.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter.
• Distinguish carefully between acute insufficiency and chronic cerebral ischemia (I67.82), which represents ongoing, less severe blood flow reduction.