"Autism spectrum disorders" means pervasive developmental disorders as defined in the most recent edition of the Diagnostic and Statistical Manual of Mental Disorders, including autism, Asperger's disorder, and pervasive developmental disorder not otherwise specified.
"Diagnosis of autism spectrum disorders" means one or more tests, evaluations, or assessments to diagnose whether an individual has autism spectrum disorder that is prescribed, performed, or ordered by (A) a physician licensed to practice medicine in all its branches or (B) a licensed clinical psychologist with expertise in diagnosing autism spectrum disorders.
"Medically necessary" means any care, treatment, intervention, service or item which will or is reasonably expected to do any of the following: (i) prevent the onset of an illness, condition, injury, disease, or disability; (ii) reduce or ameliorate the physical, mental or developmental effects of an illness, condition, injury, disease, or disability; or (iii) assist to achieve or maintain maximum functional activity in performing daily activities.
"Treatment for autism spectrum disorders" shall include the following care prescribed, provided, or ordered for an individual diagnosed with an autism spectrum disorder by (A) a physician licensed to practice medicine in all its branches or (B) a certified, registered, or licensed health care professional with expertise in treating effects of autism spectrum disorders when the care is determined to be medically necessary and ordered by a physician licensed to practice medicine in all its branches:
215 ILCS 5/356z.14