Other cerebrovascular vasospasm and vasoconstriction

This code describes a temporary narrowing of blood vessels in the brain due to involuntary muscle contraction, not otherwise specified as a subarachnoid hemorrhage or other specific cerebrovascular condition. This vasoconstriction can reduce blood flow to brain tissue, potentially leading to ischemic symptoms. It encompasses various forms of cerebral vasospasm or vasoconstriction that do not fit more specific ICD-10-CM codes.

Use this code when documentation clearly indicates cerebrovascular vasospasm or vasoconstriction without an identified underlying cause like subarachnoid hemorrhage, or when the specific type of vasospasm is not further detailed. This code is appropriate for conditions such as reversible cerebral vasoconstriction syndrome (RCVS) when a more specific code for RCVS is not available, or other idiopathic cerebral vasoconstrictive events. Documentation should explicitly state "cerebrovascular vasospasm" or "cerebral vasoconstriction" and rule out more specific etiologies.

• Do not use this code for vasospasm secondary to subarachnoid hemorrhage (SAH); instead, use codes from category I67.841.
• Ensure documentation specifies "other" or "unspecified" if a more precise diagnosis for the vasospasm is not available.
• Consider sequencing this code as a secondary diagnosis if the primary reason for the encounter is a symptom or complication resulting from the vasospasm.