Autistic disorder

This code represents a pervasive developmental disorder characterized by significant impairments in social interaction and communication, alongside restricted, repetitive patterns of behavior, interests, or activities. Onset typically occurs before three years of age, impacting various aspects of development.

Apply this code for patients diagnosed with classic autism, exhibiting the full spectrum of diagnostic criteria for autistic disorder as defined by the DSM-IV or ICD-10. Documentation should clearly outline the presence of qualitative impairments in social interaction, communication, and restricted/repetitive behaviors.

• Do not code this with F84.5 (Asperger's syndrome) due to the Excludes1 note; these are mutually exclusive diagnoses.
• Ensure documentation specifies "autistic disorder" or "classic autism" rather than general "autism spectrum disorder" if F84.0 is intended.
• Consider additional codes for associated intellectual disabilities (F70-F79) or other co-occurring mental health conditions.