The powerful physicians group referred to a S&P Global Ratings estimate that as many as 10 million Americans could lose coverage under the GOP plan. It was figured out this way: About 2 million and 4 million people might lose the insurance they purchased in the individual health exchanges under Obamacare. And another 4 million and 6 million could lose their coverage under Medicaid.

The proposal to replace Obamacare “would reverse the coverage gains achieved under the (Affordable Care Act),” the AMA said in a statement today.

The Republicans’ plan “as introduced, it does not align with the health reform objectives that the AMA set forth in January to protect patients,” the AMA said. “While the ACA is imperfect, the current version of the AHCA is not legislation we can support.”

“The replacement bill, as written, would reverse the coverage gains achieved under the ACA,” the powerful physicians’ group said.

The AMA sent a letter to House committees beginning today reviewing the plan, said the organization’s CEO and Executive Vice President James L. Madara, MD.  The plan “just won’t do,” he said.