There are 2 ICD-9-CM codes below 299.8 that define this diagnosis in greater detail. Do not use this code on a reimbursement claim.
Clinical Information
Neuropsychiatric disorder whose major manifestation is an inability to interact socially; other features include poor verbal and motor skills, singlemindedness, and social withdrawal
Syndrome or disorder usually first diagnosed in childhood, characterized by severe and sustained impairment in social interactions and restricted, repetitive patterns of behaviors, interests, and activities
299.8 Excludes
simple stereotypes without psychotic disturbance (307.3)