G04.0

Clinical Information

• An acute or subacute inflammatory process of the central nervous system characterized histologically by multiple foci of perivascular demyelination. Symptom onset usually occurs several days after an acute viral infection or immunization, but it may coincide with the onset of infection or rarely no antecedent event can be identified. Clinical manifestations include confusion, somnolence, fever, nuchal rigidity, and involuntary movements. The illness may progress to coma and eventually be fatal. Adams et al., Principles of Neurology, 6th ed, p921)

• An inflammatory process affecting the central nervous system. It is characterized by perivascular demyelination. Symptoms usually follow an acute viral infection or immunization and include fever, confusion, somnolence and involuntary movements. It may lead to coma and death.

Details

• G04.0 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 G04.0 became effective on October 1, 2022.

• This is the American ICD-10-CM version of G04.0 – other international versions of ICD-10 G04.0 may differ.