WASHINGTON (AP) - Medicare will change the way it pays hospitals and doctors to reward quality over volume, the Obama administration said Monday, in a shift that officials hope will be a catalyst for the nation's $3-trillion health care system.

WASHINGTON (AP) Medicare will change the way it pays hospitals and doctors to reward quality over volume, the Obama administration said Monday, in a shift that officials hope will be a catalyst for the nation's $3-trillion health care system.

"It is in our common interest to build a health care system that delivers better care, spends health care dollars more wisely and results in healthier people," said Health and Human Services Secretary Sylvia M. Burwell.

A broad cross-section of health-care industry representatives attended Burwell's announcement, including insurers, hospitals, and doctors, as well as employers, who provide coverage for most workers and their families.

The shift won immediate support from insurers and the American Hospital Association. The professional group representing primary care doctors also said it's "on board." But American Medical Association president Robert Wah stopped short of an endorsement, telling reporters his group is encouraged by the administration's overall direction but wants specifics.

Burwell also announced the formation of the Learning and Action Network, a group that will bring together a wide range of affected parties to drive change in how America pays for health care. It was unclear Monday whether the group will operate under federal open meetings rules. A first meeting is tentatively planned for March.

Supporters say the ultimate goal is to promote and reward quality care, not just the sheer volume of services like imaging scans and some elective surgeries.

Medicare and employers were already moving in that direction, but Burwell's announcement sets specific goals and timetables. "It's time we put our money where our mouth is," said Sen. Ron Wyden of Oregon, the top Democrat on the committee that oversees Medicare.

Still, the outlook for the administration's initiative is unclear. Other lofty aspirations have not been fulfilled. Although there's been real progress, President Barack Obama's goal of providing every American with a secure electronic medical record has not been met.

Medicare continues to grapple with longstanding financing problems, despite a welcome slowdown in spending over the last few years. Among the issues is a budget formula that will cut doctor payments by about 20 percent in April unless Congress acts.

But Burwell says it's time to take a longer-term view.

Building on experiments under the president's health care law, she set a goal of tying 30 percent of payments under traditional Medicare to new models of care by the end of 2016. That would rise to 50 percent of payments two years thereafter.

Those new models include so-called accountable care organizations, in which doctors coordinate care to help keep patients from landing in the hospital for avoidable problems. Another approach is known as a medical home, in which nurses monitor patients with chronic conditions like high blood pressure, to make sure they are within acceptable ranges.

HHS also set a goal of tying 85 percent of all payments under traditional Medicare to measures of quality or value by the end of 2016. That would rise to 90 percent two years thereafter. Some of those measures are already in effect. For example, hospitals with high rates of patients re-admitted within a month of being sent home face financial penalties.

Medicare is the government's flagship health insurance program, serving seniors and disabled people at a cost of $600 billion a year. About 55 million people are covered, with services financed through payroll taxes on workers employers, as well as beneficiary premiums. Roughly 7 out of 10 beneficiaries are in the traditional program, while the rest are covered through private insurance plans offered under Medicare's umbrella.

The administration also wants state Medicaid programs to join the payment-for-quality initiative.

The $2.9 trillion-a-year U.S. health care system remains at the forefront of scientific innovation globally. But there is widespread agreement that it costs the nation too much. Americans are no healthier than citizens of other economically advanced countries that spend less per person.

Many U.S. patients get treatments and tests that either don't help them or have problematic side effects. Patients can see many different specialists, but it's hard to find doctors who can piece the whole picture together and coordinate patient care. The price of new drugs is straining the budgets of insurers and Medicaid programs. And fraudsters take a cut of the health care dollar that's estimated to run into the tens of billions of dollars annually.