What is PDD?


Pervasive Developmental Disorders.  To begin with, there is not a diagnosis of PDD.  A service provider should not ever diagnosis your child with PDD.  Why?   Because there is not a singular diagnosis of PDD.  Notice what PDD stands for:   Pervasive Developmental Disorders.  It is a plural umbrella term for several disorders and syndromes.  These are considered to be mental and/or behavioral disorders that may or may not have biological basis or causes.   These disorders are defined in two places.  As with many things, there is the American version and the rest of the world version.  The American version is defined in the  Diagnostic and Statistical Manual of Mental Disorders (DSM) a diagnostic manual printed by the American Psychiatric Association (APA).  This manual is continually revised and the latest revision is revision 4 (DSM-IV). The other version is the World Health Organization's (WHO) International Statistical Classification of Diseases and Related Health Problems (10th Revision), also know as ICD-10.   Specifically it is Chapter V that we deal with: The ICD-10 Classification of Mental and Behavioural Disorders.  And of Chapter V, there are three books, Clinical Descriptions and Diagnostic Guidelines, Diagnostic Criteria for Research, and Primary Care Version.  The classification codes for PDD come from the first book of Chapter V, Clinical Descriptions and Diagnostic Guidelines.

As stated before, PDD is an umbrella term for several disorders.  They are (listed by reference source and diagnostic code):


299.0    Autistic Disorder
299.80    Rett's Disorder
299.10    Childhood Disintegrative Disorder
299.80    Asperger's Disorder
299.80    Pervasive Developmental Disorder Not Otherwise Specified


F84.0    Childhood Autism
F84.1    Atypical Autism
F84.2    Rett's Syndrome
F84.3    Other Childhood Disintegrative Disorder
F84.4    Overactive Disorder Associated with Mental Retardation and Stereotyped Movements
F84.5    Asperger's Syndrome
F84.8    Other Pervasive Developmental Disorders
F84.9    Pervasive Developmental Disorder, Unspecified

I will have more information later, but for now, please read what each of the reference manuals have to say.                   



Want to contact me?  Press here: JJjackson@pervasivedevelopmentaldisorders.com
Return to the PDD Support Home Page