WASHINGTON - While Sens. Hillary Rodham Clinton and Barack Obama fight over who has the better health plan for the uninsured, they say little about a more immediate challenge that will confront the next administration: how to tame the soaring costs of Medicare and Medicaid.

The programs, for older Americans and low-income people, cost $627 billion last year -- 23 percent of all federal spending. With no change in existing law, the Congressional Budget Office says, that cost will double in 10 years and the programs will account for more than 30 percent of the budget.

Economists and health policy experts say the programs are unsustainable in their current form, because they are growing much faster than the economy or the revenues used to finance them. Medicare's hospital insurance trust fund is expected to run out of money in 11 years.

But cutbacks are not a popular theme for candidates wooing voters who want more care at a lower cost.

The Democrats do not say, in any detail, how they would slow the growth of Medicare and Medicaid or what they think about the main policy options: rationing care, raising taxes, cutting payments to providers or requiring beneficiaries to pay more.

Nor do they say how they would overcome the health-care industry lobby, which has blocked proposals for even modest reductions in Medicare payment rates.

The leading edge of the baby boom generation becomes eligible for Medicare in three years. The number of beneficiaries, now 44 million, is expected to reach 55 million by 2017. But those numbers are less significant than other factors.

"Most of the long-term rise in health-care spending is associated with the use of new medical technologies," a recent budget office report said. It suggested that more selective use could save substantial amounts -- a prospect that alarms manufacturers of some medical devices.

"Medical technology has saved and improved countless lives by reducing disability and death rates from cancer, heart disease and other conditions," said Stephen J. Ubl, president of the Advanced Medical Technology Association.

Spending on Medicare and Medicaid tends to increase in tandem with health spending.

"Federal health spending trends should not be viewed in isolation from the health-care system as a whole," said David M. Walker, the comptroller general of the United States.

When Medicare and Medicaid squeeze payments to doctors and hospitals, health-care providers often try to increase charges to other patients, Walker said. To rein in the costs of Medicare and Medicaid, he said, it will be necessary to slow the growth of health costs generally.

For several years, an independent federal panel, the Medicare Payment Advisory Commission, has recommended that Congress reduce payments to private health plans. Those payments are about 12 percent higher, on average, than the cost of caring for similar patients in the traditional fee-for-service Medicare program.

Insurance companies have successfully resisted the proposal.

To help pay for their coverage plans, Clinton and Obama both say they would roll back the "Bush tax cuts" for the wealthiest Americans. But major provisions of the tax cuts, adopted in 2001 and 2003, are already scheduled to expire at the end of 2010. Democratic lawmakers, moreover, have committed the savings from the elapsed tax cuts several times to other pet programs, like eliminating the alternative minimum tax.

Some experts say the only real way to tame health-care costs is by limiting access to expensive treatments or by requiring affluent Americans to pay for more of their health care.

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