I was dx'ed with it recently.
I think it's this: pdd stands for Pervasive Developmental Disorder (PDD)
there are currently 5 PDD's (PDD is another name for Autistic Spectrum Disorders?)
if one does not fir the criteria for any specific PDD but meets some of the criteria, then one can be dx'ed with PDD-NOS
the severity varies.
http://www.nimh.nih.gov/health/publicat ... shtml#pub2
The pervasive developmental disorders, or autism spectrum disorders, range from a severe form, called autistic disorder, to a milder form, Asperger syndrome. If a child has symptoms of either of these disorders, but does not meet the specific criteria for either, the diagnosis is called pervasive developmental disorder not otherwise specified (PDD-NOS). Other rare, very severe disorders that are included in the autism spectrum disorders are Rett syndrome and childhood disintegrative disorder. This brochure will focus on classic autism, PDD-NOS, and Asperger syndrome, with brief descriptions of Rett syndrome and childhood disintegrative disorder below.
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All men are frauds. The only difference between them is that some admit it. I myself deny it.
-HL Mencken
-as of now official dx is ADHD (inattentive type) but said ADD (314.00) on the dx paper, PDD-NOS and was told looks like I have NLD