@mcooley04 Welcome to Mayo Clinic Connect.

It depends on where you live, how your healthcare is set up. At times a mental health professional can direct you to a source for evaluation, or your primary care provider. Here is an article from Autism Speaks, that addresses how you might go about all this: https://www.autismspeaks.org/expert-opinion/getting-evaluated-autism-adult-where-go-who-see

Is this evaluation for yourself or a family member? I am curious what has happened that you feel the need to have this evaluation done?
Ginger