Direct answer
Quick AnswerThe DSM-5 classifies autism spectrum disorder into three support levels: Level 1 ("Requiring Support") — noticeable social difficulties, some inflexibility; Level 2 ("Requiring Substantial Support") — marked social deficits, restricted behaviours obvious to casual observers; Level 3 ("Requiring Very Substantial Support") — severe social communication challenges, extreme difficulty with change. In Ontario, all three levels qualify for OAP registration.
Start with the short answer, then reveal deeper context where helpful.
Autism support levels describe the amount of support a person needs, not the severity of autism itself. They are assessed across two domains: social communication and restricted/repetitive behaviours. A person can have different levels across these two domains.
Autism support levels describe the amount of support a person needs, not the severity of autism itself. They are assessed across two domains: social communication and restricted/repetitive behaviours. A person can have different levels across these two domains.
Support levels can change over time with appropriate intervention, development, and environmental modifications. A child assessed at Level 2 may move to Level 1 with effective therapy, or support needs may increase during transitions or stressful periods.
All three DSM-5 support levels qualify for OAP registration and core clinical services. The childhood budget amount is not directly determined by support level — it is based on the child's age. However, children with higher support needs (Levels 2-3) may require more intensive therapy programs that utilize the full budget.
APA
DSM-5 Autism Spectrum Disorder Diagnostic Criteria, Section 299.00 (2013)
A comprehensive autism assessment includes developmental history, standardized testing (ADOS-2, ADI-R), cognitive assessment, and clinical observation.
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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
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