Autism and change of diagnosis

What I’m trying to find out is if you have a primary diagnosis of autism , the psychiatrist, an expert in autism who made the diagnosis stated it was to be the person`s primary diagnosis. But now someone is trying to change this to a dual diagnosis. I think by doing this and placing the emphasis on anxiety adding it higher on the list is distorting the clinical and legal interpretation and contradicts the diagnosing psychiatrist’s authoritative diagnosis.

The dual diagnosis refers to and non-organic psychosis. This is not indicated by a psychiatrist but is mentioned in a support plan.