Proponents of overhauling the nation’s health care argue that hospitals are charging too much and could lower their prices without sacrificing the quality of their care. High drug prices, surprise hospital bills and other financial burdens from the overwhelming cost of health care have caught the attention (and drawn the ire) of many in Congress, with a variety of proposals under consideration this year.

But those in favor of the most far-reaching changes, including Senator Bernie Sanders, who unveiled his latest Medicare for all plan as part of his presidential campaign, have remained largely silent on the question of how the nation’s 5,300 hospitals would be paid for patient care. If they are paid more than Medicare rates, the final price tag for the program could balloon from the already stratospheric estimate of upward of $30 trillion over a decade. Senator Sanders has not said what he thinks his plan will cost, and some proponents of Medicare for all say these plans would cost less than the current system.

The nation’s major health insurers are sounding the alarms, and pointing to the potential impact on hospitals and doctors. David Wichmann, the chief executive of UnitedHealth Group, the giant insurer, told investors that these proposals would “destabilize the nation’s health system and limit the ability of clinicians to practice medicine at their best.”

Hospitals could lose as much as $151 billion in annual revenues, a 16 percent decline, under Medicare for all, according to Dr. Kevin Schulman, a professor of medicine at Stanford University and one of the authors of a recent article in JAMA looking at the possible effects on hospitals.

“There’s a hospital in every congressional district,” he said. Passing a Medicare for all proposal in which hospitals are paid Medicare rates “is going to be a really hard proposition.”

Richard Anderson, the chief executive of St. Luke’s University Health Network, called the proposals “naïve.” Hospitals depend on insurers’ higher payments to deliver top-quality care because government programs pay so little, he said.



“I have no time for all the politicians who use the health care system as a crash-test dummy for their election goals,” Mr. Anderson said.