Under federal law, health insurers must spend at least 80 percent of premium revenues on medical services or quality improvement. Jodie Morris/Kaiser Health News hide caption

itoggle caption Jodie Morris/Kaiser Health News

Most doctors surveyed said they think visits to emergency rooms will increase as the new health law is implemented. iStockphoto.com hide caption

itoggle caption iStockphoto.com

The CBO says House Budget Committee Chairman Paul Ryan's plan for Medicare could lead to health care rationing. Ryan is shown here with Republican members of his committee on Capitol Hill, April 5, 2011. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP