New Definition of Autism May Exclude Many

Proposed changes in the definition of autism would sharply reduce the skyrocketing rate at which the disorder is diagnosed and may make it harder for many people who would no longer meet the criteria to get health, educational and social services, a new analysis suggests.

The definition is under review by an expert panel appointed by the American Psychiatric Association, which is completing work on the fifth edition of its Diagnostic and Statistical Manual of Mental Disorders. The D.S.M, as the manual is known, is the standard reference for mental disorders, driving research, treatment and insurance decisions.