Postinfectious acute necrotizing hemorrhagic encephalopathy

This code represents a rare and severe inflammatory brain disorder characterized by acute onset of neurological deficits following an infection. It involves widespread necrosis and hemorrhage within the brain parenchyma, often leading to rapid deterioration of neurological function. The condition is distinct from other forms of encephalitis due to its specific pathological features.

Apply this code when documentation explicitly states a diagnosis of postinfectious acute necrotizing hemorrhagic encephalopathy. This diagnosis is typically made based on clinical presentation, neuroimaging (showing multifocal lesions with hemorrhage and necrosis), and exclusion of other causes of encephalopathy. Ensure the "postinfectious" etiology is clearly documented.

• Differentiate from other forms of acute encephalitis (e.g., viral, autoimmune) which lack the specific necrotizing hemorrhagic features.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter.
• Verify documentation confirms the acute nature and the presence of both necrosis and hemorrhage.