This report from the Center on Budget and Policy Priorities published 5/25/17 outlines the key findings of the Congressional Budget Office (CBO) regarding the American Health Care Act as approved by the House of Representatives.  Here’s an excerpt from this 3-page report:

“Along with increasing the number of uninsured by 23 million, the House Republican bill to “repeal and replace” the Affordable Care Act (ACA) would force millions of people in the individual market to pay more for health insurance and health care, the Congressional Budget Office’s (CBO) analysis finds — especially older people and people with pre-existing conditions. House Speaker Paul Ryan, among others, has misleadingly stated that the CBO analysis “confirms that the American Health Care Act [AHCA] achieves our mission: lowering premiums.” But in claiming success, even on that narrow goal, supporters of the AHCA either misunderstand or misrepresent CBO’s conclusions.

“CBO finds that breaking the ACA’s fundamental structure would result in people paying much higher premiums for skimpier coverage that requires them to pay much more in deductibles and other out-of-pocket costs. And, in states that waive critical ACA market reforms barring insurers from charging higher premiums based on health status and requiring them to cover “essential health benefits,” people with pre-existing conditions would face even sharply higher premiums. Some would be unable to obtain coverage at all.”