The study will fulfill the following aims:
Aim 1: Validate externally the predictive risk score using Sea Mar CHC's robust data including 29,000 patients age-eligible for colorectal cancer screening; stratify patients according to risk of non-adherence to follow-up colonoscopy; and adapt patient navigation program for the local context.
Aim 2: Assess the effectiveness, costs, and cost-effectiveness of a centralized, phone-based patient navigation program for follow-up colonoscopy receipt for patients at moderate risk or high risk for non-adherence.
Aim 3: Assess differences in the intervention arms in secondary outcomes (e.g. time to colonoscopy receipt, no-show/canceled appointments, colonoscopy quality) and moderators of intervention effectiveness (e.g. probability level, intervention dose, and patient age, ethnicity, and sex)
