ICD-10 Code I67.841 – Reversible cerebrovascular vasoconstriction syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I67.841 – Reversible cerebrovascular vasoconstriction syndrome
What it is
This code identifies reversible narrowing of cerebral arteries that can reduce blood flow to the brain. It is used for the syndrome itself, not for a generic headache or stroke presentation.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include sudden severe headache, focal neurologic deficits, and angiographic evidence of multifocal arterial vasoconstriction that improves over time.
When to use this code
Use I67.841 when the provider documents reversible cerebrovascular vasoconstriction syndrome, also called RCVS. It may appear after evaluation for thunderclap headache or transient neurologic symptoms when imaging supports the diagnosis. Code the condition only when the diagnosis is established or clearly documented.
Do not use for
Do not use this code for unspecified headache, migraine, or stroke without documentation of reversible vasoconstriction syndrome. Check documentation if the record describes vasospasm from another cause.
Coding tip
Confirm that the chart explicitly states RCVS or reversible cerebrovascular vasoconstriction syndrome before assigning I67.841.