It sounds like the diagnosis is autism. "NOS" stands for Not Otherwise Specified, but it was specified as autism in your case. It likely would have said PDD-NOS if that were the diagnosis congruent with the evaluation.
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16 years old, I have synesthesia and Aspergers (probably) "I'm not a psychopath, I'm a high functioning sociopath. Do your research."- Sherlock (BBC)