The Supreme Court's review of health reform means any or all of the law's mandates, such as coverage of adult dependents up to age 26 and protections for people with pre-existing conditions, could be in jeopardy.

But health insurance exchanges -- which also must be set up as part of the law -- may survive and flourish even if the entire Affordable Care Act is struck down, industry experts said. Exchanges are meant to offer cheaper health plans, so more of the nation's 32 million uninsured can afford coverage.

Regardless of what happens to the health reform law, "there is bipartisan support for states having some kind of health insurance exchanges," said Christopher Condeluci, a tax attorney with law firm Venable LLP and former tax counsel to the Senate Finance Committee.

Among other things, health reform mandates that by 2014 all states set up a health insurance "exchange," an online marketplace where consumers who are underinsured or uninsured will be able to shop for subsidized coverage, and small businesses can buy more affordable plans for their workers.

The law also gives states federal grants to help build their exchanges.

The Court, which is expected to announce its ruling on the constitutionality of the Act later this month, could uphold the law, overturn it partially, or completely strike it down.

If the law is struck down completely, the loss of federal grants will make it harder for states to start exchanges, said Brett Graham, head of the Insurance Exchange Practice at law firm Leavitt Partners in Salt Lake City, Utah.

But the "train has already left the station" and some states will establish exchanges anyway, Graham said.

Indeed, even before health reform passed in 2010, Massachusetts and Utah already operated insurance exchanges. And a handful of states were exploring setting them up as a way to cut their health care spending by getting more residents insured, said Dan Schuyler, former director of technology who helped launch Utah's exchange in 2009.

With fewer uninsured people, there's less financial burden on states' public health-care programs such as Medicaid.