In simple words: This code refers to a condition where the blood vessels in the brain temporarily narrow, causing symptoms like severe headaches, seizures, and problems similar to a stroke.The narrowing usually goes away on its own within a few weeks or months. This is sometimes called Call-Fleming syndrome.

Reversible cerebrovascular vasoconstriction syndrome (RCVS) is a condition characterized by temporary narrowing (vasoconstriction) of the blood vessels in the brain. This can lead to various neurological symptoms, including severe headaches (often described as thunderclap headaches), seizures, and stroke-like symptoms. The vasoconstriction is typically reversible, meaning the blood vessels return to their normal size over time, usually within weeks or months.It is important to code any underlying conditions, if applicable, such as eclampsia (O15.00-O15.9).

Example 1: A 35-year-old female patient presents with a sudden onset of a severe "thunderclap" headache, followed by temporary vision loss. After a thorough neurological examination and imaging studies, she is diagnosed with reversible cerebrovascular vasoconstriction syndrome (RCVS)., A patient with a history of migraines experiences an unusually severe headache accompanied by neurological symptoms.A cerebral angiogram reveals vasoconstriction, and the patient is diagnosed with RCVS., A postpartum woman develops a sudden, severe headache and seizures. Imaging reveals reversible cerebral vasoconstriction, consistent with RCVS potentially associated with postpartum hormonal changes.

Documentation for I67.841 should include a detailed description of the presenting symptoms (e.g., headache characteristics, neurological deficits), results of imaging studies (e.g., CT angiogram, MRI), and other relevant clinical findings.It is also crucial to document the resolution of the vasoconstriction to confirm the diagnosis of RCVS.

** Consider using additional codes to identify any associated conditions such as hypertension (I10-I1A) or tobacco use (Z72.0). It's also important to differentiate RCVS from other similar conditions like primary angiitis of the central nervous system (G04.2) or cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) (I67.89).