California signed up an estimated 450,000 people under Medicaid expansion who may not have been eligible for coverage, according to a report by the U.S. Health and Human Services Department's chief watchdog.

People living in areas where there is greater consolidation among hospitals, physician groups and insurance companies pay more for health care, according to a study released Monday.

Aetna chief executive Mark Bertolini heads one of the biggest health insurers in the country and is on the cusp of a $69 billion megadeal to merge his company with pharmacy giant CVS. He says the future of health care is going to depend, mostly, on the time people spend outside the grasp of the traditional medical system.

Hospital mergers—and the effect of those mergers on medical costs—have caught the eye of California elected officials.

As policymakers gear up to address rising drug costs, a new report highlights just how much prices have gone up in recent years. 

Dale Fountain is an intensely private man. He won’t say where he works. One of his oldest friends can’t say for sure where he lives. His sister knows he was once married but she isn’t in the loop these days — they haven’t spoken in two years.