In simple words: Narrowing of blood vessels in the brain, reducing blood flow, often after a brain bleed or similar event.

Cerebral vasospasm and vasoconstriction are conditions characterized by the narrowing of blood vessels in the brain, leading to reduced blood flow.This can occur after a subarachnoid hemorrhage or other cerebrovascular events.

Example 1: A patient experiences vasospasm following a ruptured aneurysm, confirmed by angiography.I67.84 is used to document the vasospasm., A patient develops symptoms consistent with vasospasm after a subarachnoid hemorrhage, while imaging studies are inconclusive for other causes. The diagnosis I67.84 is provisionally assigned., A patient with reversible cerebral vasoconstriction syndrome (RCVS) experiences recurrent thunderclap headaches and focal neurological symptoms, confirmed by angiography. I67.841 is used if the condition is reversible, otherwise I67.84 is appropriate.

Documentation should include details of the underlying cause (e.g., subarachnoid hemorrhage), diagnostic studies (e.g., angiography, transcranial Doppler), and clinical findings related to the vasospasm (e.g., neurological deficits, altered mental status).

** Excludes1: Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5-) Occlusion and stenosis of precerebral artery causing cerebral infarction (I63.2-) Excludes2: sequelae of the listed conditions (I69.8)