Lauded as a way to boost competition and hold down prices, the co-ops had more than 1 million people enrolled in 26 states at their peak in 2015.

Six states are shifting in the next several years from the federal insurance exchange to run their own online marketplaces.

Medicaid enrollment was 72.3 million in April, up from 71.5 million in March and 71 million in February.

Some employers say testing and screening can help reduce disease transmissions and workers' fears.

The long-awaited guidance to states offers a way for states that haven't expanded under the Affordable Care Act to move ahead.

Unlike earlier Obamacare cases before the high court, the latest case has largely flown under consumers' radar.

Nearly a third of health plans on the federal exchanges don't yet have a quality rating.

Walmart is working with a startup company that uses data to identify doctors who provide high-quality care for employees.