Hypertensive encephalopathy

This code represents a severe and acute neurological complication arising from malignant hypertension, characterized by cerebral edema and increased intracranial pressure. It manifests as a rapid onset of neurological symptoms due to critically elevated blood pressure exceeding the brain's autoregulatory capacity.

Use this code when documentation clearly indicates a diagnosis of hypertensive encephalopathy, often presenting with symptoms like headache, altered mental status, seizures, or visual disturbances in the context of severe hypertension. Supporting documentation should include blood pressure readings consistent with a hypertensive crisis and neurological findings attributable to the elevated pressure.

• Differentiate from other forms of hypertensive crisis without encephalopathy; documentation must specify neurological involvement.
• Always code the underlying hypertension first, as hypertensive encephalopathy is a manifestation of severe hypertension.
• Ensure documentation explicitly states "encephalopathy" and not just "hypertensive crisis" or "hypertensive emergency" to support this specific code.