The biggest problem with 'grouping' diagnoses is that it gives less weight to rare (possibly genetically treatable) illness and decreases the funding to these unique entities. The second problem is that it will give greater donations and insurance money to certain diseases such as autism. Parents will know to 'request' an autism diagnosis so that they can get the 'guaranteed' insurance monies (up to $76,000 per year in some states and plans) thus increasing the cost of care for many children with 'autism spectrum' disorders. I believe that these 'blending of diagnoses' in the new DSM is simply a measure in finances.