PDD not otherwise specified
Classification and external resources
ICD-10	F84.9
ICD-9	299.90

Pervasive Developmental Disorder - Not Otherwise Specified (PDD-NOS) is one of the pervasive developmental disorders and autism spectrum disorders.

PDD-NOS is a diagnosis for people who are well-described by the "PDD" label, but cannot be categorized by any other disorder. It is usually milder than autism, but is more severe than asperger syndrome, and has similar symptoms to autism, with some symptoms present, and others absent.^[1] This disorder is sometimes called "atypical autism" by autism specialists. The boundaries between PDD-NOS and non-autistic conditions are not fully resolved.^[2]

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v • d • e Pervasive developmental disorders and autism spectrum Main Causes · Comorbid conditions · Epidemiology · Heritability · Sociological and cultural aspects · Therapies Diagnoses Asperger syndrome · Autism · Childhood disintegrative disorder · PDD-NOS · Rett syndrome Related conditions ADHD · Anxiety disorder · Epilepsy · Fragile X syndrome · High-functioning autism · Mental retardation Controversies Autism rights movement · Autistic enterocolitis · MMR vaccine · Thiomersal (Chelation) Lists Autism-related topics · Fictional characters · People · Speculated historical figures

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