Proposed changes to autism definition may mean new diagnoses for people with Asperger's - HealthPop. Istockphoto (CBS)The definition of autism may soon be changing, according to a new report. PICTURES: Autism-spectrum disorders: 24 warning signs The proposed revisions - which are "90 percent complete" - would dramatically change the current diagnostic criteria for an autism spectrum disorder, The New York Times reported, potentially re-diagnosing tens of thousands of people. New Definition of Autism May Exclude Many, Study Suggests. Wrightslaw Special Education Law and Advocacy.