Within the U.S. Medicaid system, 70% of enrollees are now in private health plans because state governments have discovered that these plans deliver higher quality, lower cost and better access than government-run Medicaid.

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The states and the federal government also are creating a Health Insurance Marketplace for each state, where people can compare health plans based on price and benefits and purchase the one that best fits their needs.

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In late May, the state of California said 13 health-care plans will participate in its exchange, offering insurance in the state's 19 regions, and insurers in several other states are proposing rates and plans.

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