A range of medical groups are not pleased with legislation passed by House Republicans that would repeal and replace the Affordable Care Act, with many saying the proposed law would jeopardize health coverage for millions of Americans.

The American Health Care Act cleared the U.S. House of Representatives by a 217-213 vote Thursday, with all Democrats and a handful of Republicans voting against the measure. The bill now moves to the Senate where its prospects are uncertain.

A Congressional Budget Office analysis of an earlier version of the bill found it would increase the ranks of the uninsured by 24 million people by 2024. House Republicans rushed the current version of the bill to a vote before the CBO could complete its review, but medical groups said the results would be the same.

"The bill passed by the House today will result in millions of Americans losing access to quality, affordable health insurance and those with pre-existing health conditions face the possibility of going back to the time when insurers could charge them premiums that made access to coverage out of the question," said Andrew Gurman, president of the American Medical Association.

In the hours leading up to the House vote, AMA urged its members to contact their representatives to vote against the bill. Another opponent was the American Hospital Association, with CEO Rick Pollack releasing a statement after the vote saying his organization was "deeply disappointed" with the turn of events.

"Despite last-minute changes, the proposal eliminates essential protections for older and sicker patients, including those with pre-existing conditions, such as cancer patients and the chronically ill," Pollack said. "It does little to help the 24 million Americans who would be left without coverage following repeal, and makes deep cuts to Medicaid, which provides essential services for the disabled, poor and elderly people in this country."

Chip Kahn, CEO of the Federation of American Hospitals, said the vote was "disappointing, but not surprising."

"As passed by the House of Representatives, the AHCA fails to protect the health coverage and access to care for so many Americans," Kahn said. "It also makes it more difficult for hospitals to deliver the care we all rely on."

America's Health Insurance Plans—which represents many insurers—had a mixed reaction to the legislation. CEO Marilyn Tavenner said "every American deserves coverage and care that is affordable and accessible, including those with pre-existing conditions."

"The American Health Care Act needs important improvements to better protect low- and moderate-income families who rely on Medicaid or buy their own coverage," Tavenner said. "We stand ready to work with members of the Senate and all policymakers, offering our recommendations for how this bill can be improved to ensure the private market delivers affordable coverage for all Americans."

Not all groups were disappointed with the results. U.S. Chamber of Commerce CEO Tom Donohue congratulated the House for passing the legislation, which he said was "important step forward from an unsustainable health care system that is saddling Americans with higher costs and uncertain coverage options."

"This bill contains important reforms that will lower costs and pull back on job killing tax hikes that have been stifling economic growth across the country," Donohue said.

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