Maybe the initial challenge of population health is deciding exactly what that phrase means. Is economics the challenge in growing a client base enough to scale the costs of population health? Because the end goal determines where boundaries are drawn around subjects, the answer is ‘Yes’ to these and almost all population health objective questions. “To do population health, insurers must have a critical mass of members in each of several high-cost diseases: diabetes, heart disease, cancer, behavioral health,” says Indianapolis Business Journal reporter JK Wall. While population health is often viewed as a mostly clinical measure, Kindig feels the terms population health management or population medicine better describe this physiological aspect of group wellness.