Diagnostic code
299 — Psychoses: Childhood psychoses (e.g., autism)
299 is an OHIP diagnostic code used on Ontario Health Insurance Plan claims. Psychoses: Childhood psychoses (e.g., autism).
- Code
- 299
- Description
- Psychoses: Childhood psychoses (e.g., autism)
Updated October 26, 2026
299 is the OHIP diagnostic code for autism spectrum disorder.
Conditions billed under this code
- Autism
What it covers
The Ministry lists 299 as 'Psychoses: Childhood psychoses (e.g., autism)' under Mental and Behavioural Disorders. The Schedule calls the same code 'Autism spectrum disorder (299)' (A50).
Use it for autism at any age. The Schedule uses 299 for adults with autism too, in its codes for adults with intellectual and developmental disabilities.
Close neighbours: 319 intellectual disability or global developmental delay, 315 specific developmental delays such as speech delay or dyslexia, 314 ADHD, 313 behaviour disorders of childhood, 758 chromosomal anomalies such as Down syndrome.
Billing notes
- K133, the periodic health visit for adults with intellectual and developmental disabilities, and K125, intellectual and developmental disability primary care, are payable only for listed conditions, and the claim must carry the matching code: 299 for autism spectrum disorder (A8–A9, A50).
- 299 is on the GP26 list for E078, the chronic disease assessment premium (+50%) that specialists in the listed specialties add to an office or out-patient clinic assessment (GP25–GP26).
Related codes: 319, 315, 314, 313, 758
Sources
- OHIP Diagnostic Codes (Ministry of Health, February 2026)
- Schedule of Benefits: Physician Services (effective July 1, 2026)
APEX flags claims whose diagnostic code does not fit the service billed before they come back rejected. See how APEX works · Pricing