The Canadian Chronic Disease Surveillance System (CCDSS) is a collaborative network of provincial and territorial surveillance systems, supported by the Public Health Agency of Canada (PHAC). The system collects data on all residents who are eligible for provincial or territorial health insurance. CCDSS provides standardized, national estimates of chronic disease prevalence, incidence, and outcomes by integrating various sources such as provincial and territorial health insurance registries, physician billing claims, hospital discharge abstract records, and prescription drug records.