The Center for Autism Research (CAR) has a helpful resource, “Who is Able to Diagnose Autism Spectrum Disorder?, found at https://www.carautismroadmap.org/who-is-able-to-diagnose-an-autism-spectrum-disorder/ . This information is part of the CAR Roadmap of resources about autism spectrum disorder, https://www.carautismroadmap.org/.
The site has resource covering eight different topical areas: Home and Family, Diagnoses, Education, Healthcare Treatment, Government, Community Support, Public Safety, and Education.
CAR is part of the Children’s Hospital of Philadelphia Research Institute.