WASHINGTON — Congressional budget referees say fixing a glitch in President Barack Obama's health care law would save taxpayers $13 billion without adding to the number of uninsured people.

Lawmakers introduced legislation Monday to fix the problem, a glitch that would have allowed middle-class early retirees to get health insurance at virtually no cost by qualifying for Medicaid coverage.

The Associated Press first reported the problem last month, after Medicare Chief Actuary Richard Foster raised concerns and said he was having trouble getting policymakers to pay attention.

Wyoming Republican Sen. Mike Enzi, who introduced one of the bills Monday, said he sees it as a rare opportunity for bipartisan agreement in the current budget negotiations. There was no immediate comment from the White House.