The Million Hearts Cardiovascular Disease (CVD) Risk Reduction Model (Million Hearts Model) tests whether providing targeted incentives to health care providers to reduce CVD risk lowers the incidence of first-time heart attacks and strokes among Medicare beneficiaries (ages 40-79 who have not had a previous heart attack or stroke). As part of the five-year randomized trial, participating providers calculate their Medicare patients’ risk of having a heart attack or stroke within 10 years, and receive incentives to reduce the CVD risk of high-risk beneficiaries (defined as those with a 30 percent or higher risk of a CVD event at baseline).