Complete guide for adults seeking autism diagnosis. Private assessment: $2,500-$4,000, 4-8 week wait. OHIP options extremely limited.
Private Assessment Cost
Private Wait Time
OHIP Coverage
Getting diagnosed as an adult in Ontario is not straightforward. OHIP-covered assessments are almost nonexistent for adults, so most people go private.
Registered psychologists offer adult assessments
Very few public options for adults
4-8 weeks vs 18-24 months for children
Typical private assessment fee
You talk through your concerns, childhood history, and day-to-day challenges. Usually 1-2 hours.
The psychologist uses standard assessment tools (like the ADOS-2) and reviews your history. Takes 2-4 hours total.
Go over results, discuss the diagnosis (if one is given), and ask questions. About 1 hour.
You receive a detailed report, usually 2-4 weeks after your assessment. This is the document you need for ODSP and other supports.
This page is part of the Family Resources topic cluster. Support resources for families.
By Spencer Carroll • Founder, End The Wait Ontario • Last updated: March 21, 2026
Spencer Carroll is a parent advocate who has navigated the 4+ year OAP waitlist personally. He has been invited by the World Health Organization to provide testimony on Ontario's autism services failures.
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Join thousands of Ontario families advocating for timely autism services.
Commitment to Accuracy: Our data is independently verified against official government reports (FAO, MCCSS), peer-reviewed scientific literature, and accessible public records. Last updated: February 1, 2026.
Verified Facts
Evidence supports autism screening and intervention commencing in the first 2 years of life — earlier identification directly enables earlier intervention during the highest neural plasticity window
1 in 50 — According to the 2019 Canadian Health Survey on Children and Youth, about children and youth aged 1 to 17 in Canada had an autism diagnosis
WHO recommends accessible, community-based early interventions for children with autism — timely evidence-based psychosocial interventions improve communication and social engagement
87,692 — children are registered in the Ontario Autism Program
US$2.4M — Lifetime support costs for autism with co-occurring intellectual disability can reach US$2.4 million per person (Buescher et al.)
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