B01.1

Applicable To

• Postchickenpox encephalitis, myelitis and encephalomyelitis

Clinical Information

• Inflammation of brain tissue caused by infection with the varicella-zoster virus herpesvirus 3, human). This condition is associated with immunocompromised states, including the acquired immunodeficiency syndrome. Pathologically, the virus tends to induce a vasculopathy and infect oligodendrocytes and ependymal cells, leading to cerebral infarction, multifocal regions of demyelination, and periventricular necrosis. Manifestations of varicella encephalitis usually occur 5-7 days after onset of herpes zoster and include headache; vomiting; lethargy; focal neurologic deficits; fever; and coma. from Joynt, Clinical Neurology, 1996, ch 26, pp29-32; hum pathol 1996 sep;27 9):927-38)

Details

• B01.1 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.

• The 2023 edition of ICD-10-CM B01.1 became effective on October 1, 2022.

• This is the American ICD-10-CM version of B01.1 – other international versions of ICD-10 B01.1 may differ.