Despite a looming brawl over key details, the Democratic majority is expected to pass a bill that will make ordinary Americans the ultimate stakeholders who must live with the system, adjust to changes and -- one way or another -- absorb the costs.
For laid-off autoworkers, there could be a new guarantee that they won't lose their family health insurance. A patient with heart disease could receive more advanced treatment to avoid hospitalization. Small shop owners could get help figuring out coverage for employees. An overweight teenager might find a new slim-down program at school.
And for some Americans, especially the affluent and those with traditional job-based medical insurance, there could be new or higher taxes.
After months of spadework and consultation with the interested parties, lawmakers begin the most sweeping healthcare debate in a generation with broad agreement on the need to control costs, improve the care Americans receive and expand coverage to nearly everyone.
But shadowing the debate, which is expected to dominate Washington's summer and extend into the fall, are the same vexing controversies that have derailed almost all previous efforts to reshape the U.S. healthcare system.
There is still no consensus, for example, about how large a role the federal government should play. Nor is there agreement on who should bear the cost, which could surpass $1.5 trillion over the next decade.
Obama's proposals include higher taxes for the wealthiest Americans. But that idea has generated widespread opposition in Congress.
Other financing schemes may be just as unpopular, such as taxing employer-provided health benefits or putting new levies on sugary beverages to raise revenue and encourage healthier behavior.
The first concrete legislation emerged Tuesday as Sen. Edward M. Kennedy (D-Mass.) filed a mammoth bill that, among other things, outlines a dizzying new government regulatory structure to ensure that every American gets health insurance.
Other bills are expected to follow from a trio of senior House Democrats, including Rep. Henry A. Waxman (D- Beverly Hills), and Senate Finance Committee Chairman Max Baucus (D-Mont.), whose bill may offer the best hope for gaining Republican support.
In addition, a phone-book-size catalog of amendments and less-detailed alternatives -- including many from Republicans seeking to shape the debate themselves -- are expected to compete for attention.
Though they differ on important details, the Democrats' plans all focus on three broad goals, each of which has contributed to stalemate in the past:
* Improving the quality of care for everyone by encouraging doctors, hospitals and others to adopt the best, most effective courses of treatment. Research shows that many doctors fail to adopt advances in treatment and that more than 25% of all treatment may be medically ineffective or unnecessary.
Achieving this goal moves the government into the sensitive area of relations between individual patients and their doctors.
But many health policy experts say such changes could do the most to reduce medical costs and improve care.
"At the end of the day, that may be the most important thing we end up doing," said Ken Thorpe, a healthcare economist at Emory University.
* Curbing the explosive growth in costs by prodding the medical system to make more cost-effective decisions and to increase efficiency by moving to computerized medical records.
The public and employers are staggering under the cost of the present system -- rising at more than twice the rate of inflation and expected to surpass $2.2 trillion this year. But reining in prices can narrow freedom of choice and impose changes on providers.