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The age limit had been appended to the code internally.
I received responses from (1)Bureau of Austism & (2)American Psychiatric Assoc. quote...
(1) "There is no separate diagnosis codes for adults with autism or children with autism. According to the DSM-IV (,Diagnostic and Statistical Manual of
Mental Disorders, DSM-IV) the diagnostic codes for all 5 disorders under the Autism Spectrum Disorder umbrella are in the chart below:
299.00 Autistic Disorder
299.10 Childhood Disintegrative Disorder
299.80 Rett's Disorder
299.80 Asperger's Disorder
299.80 Pervasive Developmental Disorder NOS"
(2) "The code for autism in adults is the same (299.00). While autism is usually diagnosed in childhood, it is considered a life-long disorder."