With the price of some treatments topping $100,000, patient groups are pushing for state laws to make sure insurers cover most of the costs.

The agency doesn't think it's much of a burden to ask employers to do so, but critics think otherwise.

In some states, the change in numbers may reflect how well HealthCare.gov is doing at going out for business.

Record stock prices and steadily increasing home values have made U.S. households wealthier.