Direct answer
No. In Ontario, a formal autism diagnosis must be made by a registered psychologist, developmental pediatrician, or child psychiatrist following DSM-5 criteria and documented in a formal written report. Family physicians play a critical role in recognizing early signs and making referrals, but cannot independently diagnose autism spectrum disorder for the purpose of OAP registration or other formal processes.
Start with the short answer, then reveal deeper context where helpful.
Ontario's OAP registration requirements specify that an autism diagnosis must come from a qualified regulated health professional. Accepted diagnosticians include: registered psychologists and psychological associates (regulated by the College of Psychologists of Ontario), developmental pediatricians, child and adolescent psychiatrists, and some pediatricians with appropriate training in autism assessment. The diagnosis must follow DSM-5 criteria and be provided in a formal written report — a brief letter or verbal statement is insufficient.
Ask your family doctor for a referral to a developmental pediatrician or regional autism diagnostic hub. Bring documentation of your concerns: videos of the child's behaviour, completed screening tools, teacher observations, and any developmental milestone records. A clear, specific referral letter from your GP speeds up the intake process at specialist clinics.
Ontario's OAP registration requirements specify that an autism diagnosis must come from a qualified regulated health professional. Accepted diagnosticians include: registered psychologists and psychological associates (regulated by the College of Psychologists of Ontario), developmental pediatricians, child and adolescent psychiatrists, and some pediatricians with appropriate training in autism assessment. The diagnosis must follow DSM-5 criteria and be provided in a formal written report — a brief letter or verbal statement is insufficient.
Family physicians (GPs) and nurse practitioners can screen for autism using tools like the Modified Checklist for Autism in Toddlers (M-CHAT) at 18 and 24-month well-baby visits. If autism is suspected, the GP's role is to make a referral to a developmental pediatrician, regional diagnostic hub, or registered psychologist for formal assessment. Getting the referral letter quickly is important given the long wait times.
Ask your family doctor for a referral to a developmental pediatrician or regional autism diagnostic hub. Bring documentation of your concerns: videos of the child's behaviour, completed screening tools, teacher observations, and any developmental milestone records. A clear, specific referral letter from your GP speeds up the intake process at specialist clinics.
If your GP is unfamiliar with autism assessment pathways, you can self-refer to some private psychologists in Ontario — check the College of Psychologists and Behaviour Analysts of Ontario's public register (cpbao.ca) to find registered psychologists who conduct autism assessments. Some speech-language pathologists and occupational therapists can also administer screening tools, but cannot provide the formal diagnostic report required for OAP registration.
MCCSS
Ontario Autism Program, Diagnostic Documentation Requirements for OAP Registration (2024)
CPO
College of Psychologists of Ontario, Scope of Practice — Autism Assessment (2024)
In Ontario, autism can be diagnosed by psychologists, developmental pediatricians, psychiatrists, and some pediatricians. Learn the pathways and costs.
A comprehensive autism assessment includes developmental history, standardized testing (ADOS-2, ADI-R), cognitive assessment, and clinical observation.
Autism assessment in Ontario: OHIP-covered assessments at hospital hubs are free but have 3-5 year waits. Private comprehensive assessments cost $3,000-$5,000. Learn your options.
Commitment to Accuracy: Our data is verified against official government reports (FAO, MCCSS), peer-reviewed scientific literature, and accessible public records. Last updated: March 24, 2026.
Written by Spencer Carroll
Founder & Autism Advocate