Pervasive developmental disorder not otherwise specified

Uncommon card · No. 161946

Pervasive developmental disorder not otherwise specified (PDD-NOS) is a historic psychiatric diagnosis first defined in 1980 that has since been incorporated into autism spectrum disorder in the DSM-5 (2013). According to the earlier DSM-IV, PDD-NOS referred to "mild or severe pervasive deficits in the development of reciprocal social interaction and/or verbal and nonverbal communication skills, or when stereotyped behavior, interests, and/or activities are present, but the criteria are not met for a specific PDD" or for several other disorders. PDD-NOS was one of four disorders collapsed into the diagnosis of autism spectrum disorder in the DSM-5, and also was one of the five disorders classified as a pervasive developmental disorder (PDD) in the DSM-IV. The ICD-10 equivalents also became part of its definition of autism spectrum disorder, as of the ICD-11. PDD-NOS included atypical autism, a diagnosis defined in the ICD-10 for the case that the criteria for autistic disorder were not...

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