J. Scott Applewhite, File, Associated Press
In this March 23, 2010 file photo, President Barack Obama signs the health care bill, in the East Room of the White House in Washington.
WASHINGTON — Tackling a huge logistical challenge, the Obama administration Monday released an ambitious blueprint for states to match up uninsured Americans with coverage that's right for them under the health care overhaul law.
The long-awaited regulation, released as the Supreme Court prepares to hear a challenge to the law, stresses state and federal flexibility.
Starting Jan. 1, 2014, new health insurance markets called exchanges must be up and running in every state, the linchpin of a plan to eventually provide coverage to most of the nation's 50 million uninsured.
The new marketplaces are supposed to work like an Amazon.com for health insurance, providing consumers with one-stop shopping for competitively priced coverage.
"More competition will drive down costs and exchanges will give individuals and small businesses the same purchasing power big businesses have today," Health and Human Services Kathleen Sebelius said in a statement.
Experts say it's anybody's guess how the national rollout will go. If a state is not ready, the law requires the federal government to step in to run its exchange. But the Obama administration's request for $800 million to operate federal exchanges has gotten a frosty reception from congressional Republicans.
The new markets are for individuals and small businesses buying plans. Most people who now have employer health insurance will not have to make changes. It's a design that works well in Massachusetts, where an exchange has been in place for several years.
Massachusetts achieved political consensus about its health care overhaul under former GOP Gov. Mitt Romney, who is now seeking his party's presidential nomination. That's far different from the enduring national divisions over President Barack Obama's law, even if it used Romney's as a foundation.
Setting up 50 state exchanges wouldn't be easy even if the federal overhaul enjoyed widespread support.
For things to go smoothly, state and federal officials must work together to verify private personal and financial details for millions of people, make sure that consumers are enrolled in the right health plan, and accurately calculate how much government aid, if any, each household is entitled to.
All that has to get done in hours, not weeks.
Nearly 30 million people are eventually expected to get private health coverage through exchanges, about half of whom are currently uninsured.
Another group of uninsured people — as many as 16 million low-income Americans expected to qualify for Medicaid — could also enter the system through their exchanges.
States are moving in fits and starts to set up the new markets. Many are on the sidelines waiting for the Supreme Court to rule on whether the federal law is constitutional.
Under the law, most Americans will have a legal responsibility to carry health insurance, either through their job, a government program or by buying their own. Millions will receive financial assistance for their premiums.
Whether that amounts to an unconstitutional expansion of federal power is among the subjects of a showdown that begins March 26, when the high court is set to begin an unusual three days of arguments. A decision is expected by June.
Sebelius says she expects the court to uphold Obama's Affordable Care Act and thinks states will move quickly once the court has ruled.
Reaction to the complex new federal regulation will probably take several days to filter in. The administration says it received nearly 25,000 comments, and some aspects of the rule will remain open for additional comment before they are made final.
States have until Jan. 1, 2013 to obtain federal approval for their exchanges. Among the key elements:
— States can receive conditional federal approval for their exchanges if their plans are far along but not final by Jan. 1, 2013. States can operate exchanges in partnership with other states. The federal government will provide funding for different types of exchanges to allow for flexibility.
— The state exchanges themselves will determine the number and type of health plans offered to consumers, within broad standards set by the federal government. Plans will have to comply with marketing rules to ensure they are not trying to cherry-pick the healthiest customers in the state.
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— Consumers will be able to apply online for coverage in their state exchanges. To reduce paperwork, exchanges will rely on existing computer databases to verify basic personal information and eligibility. However, some key details, such as whether the consumer is a legal resident of the U.S., may have to be verified by the government. And the IRS will have final say on tax credits.
— Exchanges will be able to pick from two federally approved methods for coordinating with the Medicaid program in their states.
— Exchanges will be able to use intermediaries called "navigators" to help educate consumers and small businesses about how the new system works.