RecruitingBehavioural interventionEvaluating the Implementation of a Comprehensive Multilevel Virtual Oncology Program Among Veterans Diagnosed With Lung, Colorectal, Prostate, and Breast Cancers in the US Department of Veterans AffairsThe objective of the pragmatic trial to test the effectiveness of an existing, ongoing clinical service, the VA National TeleOncology program (NTO), a multilevel telehealth population health management program. The primary aims are to study the intervention and determine its effectiveness on telehealth engagement, clinical quality, and healthcare cost outcomes across personal characteristics.