The ObamaCare law requires the expansion of the federal-state safety-net program to cover more low-income people. Medicaid is expected to account for about half the 25 million uninsured people who, the Congressional Budget Office estimates, eventually will gain coverage through the law. The federal government will pay the full cost of the new coverage from 2014-2016, then phase down to 90 percent. Some states have accepted the expansion,while others have rejected it, including Texas and Florida, which have many uninsured residents. Many adults below the poverty level will remain uninsured in the refusing states. A state can change its decision at any time, but the full federal payment for the expansion is only available through 2016.