ICD-10 Code I67.83 – Posterior reversible encephalopathy syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I67.83 – Posterior reversible encephalopathy syndrome
What it is
I67.83 identifies posterior reversible encephalopathy syndrome, a neurologic condition marked by reversible brain swelling, usually in the posterior regions. Use it when the diagnosis is documented and supported by clinical or imaging findings.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include headache, altered mental status, seizures, visual disturbance, and imaging evidence of vasogenic edema, often in the parieto-occipital areas.
When to use this code
Use I67.83 when the provider documents posterior reversible encephalopathy syndrome or PRES. It may appear in inpatient, emergency, or neurology records with MRI or CT findings consistent with the syndrome. Code only when the condition is clearly stated or strongly supported in the note.
Do not use for
Do not use this code for nonspecific headache, seizure, or encephalopathy without documented PRES. Check documentation if the record only mentions cerebral edema or hypertensive crisis without confirming the syndrome.
Coding tip
Match the code to the provider’s final diagnosis, not just imaging impressions or suspected PRES.