G40.8

Applicable To

• Epilepsies and epileptic syndromes undetermined as to whether they are focal or generalized

• Landau-Kleffner syndrome

Clinical Information

• A rare childhood syndrome characterized by the progressive or sudden inability to understand and use spoken language aphasia) and paroxysmal electrical brain waves. Patients develop epileptic seizures and behavioral changes.

• A syndrome characterized by the onset of isolated language dysfunction in otherwise normal children age of onset 4-7 years) and epileptiform discharges on electroencephalography. Seizures, including atypical absence epilepsy, absence), complex partial epilepsy, complex partial), and other types may occur. The electroencephalographic abnormalities and seizures tend to resolve by puberty. The language disorder may also resolve although some individuals are left with severe language dysfunction, including aphasia and auditory agnosia. from menkes, textbook of child neurology, 5th ed, pp749-50; j child neurol 1997 nov;12 8):489-495)

Details

• G40.8 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 G40.8 became effective on October 1, 2022.

• This is the American ICD-10-CM version of G40.8 – other international versions of ICD-10 G40.8 may differ.