This is part 1 of Health Care's Colossus, a series about how UnitedHealth Group wields its unrivaled physician empire to boost its profits and ... health care in the United States.

But because their profits aren't growing, their investors aren't happy: Shares of UnitedHealth, CVS Health, and other large health care conglomerates have fallen this year, while the overall ...

would force health insurers to divest their pharmacy businesses within three years. Companion legislation ... cost controls might pinch managed care profits, it would lead also to cost-shifting.