This week in health care business news: UnitedHealth's talking points, hospitals pursue volume, and doctors near a Medicare pay boost.

The United States didn't have any cities make the top 10 or the top 20 and that has a lot to do with its higher crime rates, lower social stability and infrastructure, Nicholls says.

UnitedHealth changes leadership at care delivery unit Patrick Conway, who recently became chief executive of the larger Optum health services division, will take on CEO duties at Optum Health.