Autism spectrum disorder with disorder of intellectual development and impaired functional language without loss of previously acquired skills (Q91960)

All definitional requirements for both autism spectrum disorder and disorder of intellectual development are met and there is marked impairment in functional language relative to the individual’s age, with the individual not able to use more than single words or simple phrases for instrumental purposes (e.g., to express personal needs and desires). The clinical history does not include a loss of previously acquired skills.