Diagnostic code
290 — Psychoses: Senile dementia, presenile dementia
290 is an OHIP diagnostic code used on Ontario Health Insurance Plan claims. Psychoses: Senile dementia, presenile dementia.
- Code
- 290
- Description
- Psychoses: Senile dementia, presenile dementia
Updated October 26, 2026
290 is the OHIP diagnostic code for dementia.
Conditions billed under this code
- Dementia
What it covers
The Ministry lists 290 as 'Psychoses: Senile dementia, presenile dementia' under Mental and Behavioural Disorders.
Use it for dementia, whether it starts in old age or earlier ('presenile'). In ICD-9, Alzheimer's disease itself is filed under 331 (other cerebral degenerations); 290 describes the dementia.
Close neighbours: 331 other cerebral degenerations, 297 delirium, 291 alcohol-induced mental disorders including Korsakov's psychosis, 332 Parkinson's disease, 797 senility.
Billing notes
- 290 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: 331, 297, 291, 332, 797
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