PDDNOS

PDD-NOS stands for Pervasive Developmental Disorder Not Otherwise Specified. It was a diagnostic category in the DSM-IV-TR used for individuals who show significant impairments in social interaction and communication, or unusual or restricted behaviors, but do not meet the full criteria for a specific pervasive developmental disorder such as autistic disorder, Asperger syndrome, or Rett syndrome. The label was applied when symptoms were pervasive but did not fit the patterns required for a distinct disorder, or when there was an atypical presentation.

In practice, PDD-NOS captured a broad range of presentations, including children with milder autism features, late-onset symptoms, or uneven profiles of impairment across domains. Onset is typically in early childhood, though exact age of onset varies.

With DSM-5, published in 2013, the separate PDD-NOS category was eliminated and the autism spectrum disorders were consolidated under the umbrella of autism spectrum disorder (ASD). Most individuals previously diagnosed with PDD-NOS would now receive an ASD diagnosis, with severity specifiers. Some individuals who mainly have social communication difficulties without restricted or repetitive behaviors may be diagnosed with social communication disorder instead.

Treatment for individuals with PDD-NOS emphasized early intervention and comprehensive services, including applied behavior analysis, speech and language therapy, occupational therapy, and educational supports. There is no cure; outcomes depend on early access to services and ongoing support.