WASHINGTON  Doctors, hospitals, drug makers and insurance companies will join President Obama on Monday in announcing their commitment to a sharp reduction in the growth of national health spending, White House officials said Sunday.

The officials said the plan could save $2,500 a year for a family of four in the fifth year and a total of $2 trillion for the nation over 10 years. That could make it less expensive for Congress to enact comprehensive health insurance coverage, a daunting challenge facing the Obama administration.

At this point, administration officials said, they do not have a way to enforce the commitment, other than by publicizing the performance of health care providers to hold them accountable.

By offering to hold down costs voluntarily, providers said, they hope to stave off new government price constraints that might be imposed by Congress or a National Health Board of the kind favored by many Democrats.