The nonpartisan Congressional Budget Office said Tuesday that repealing major provisions of the Affordable Care Act, while leaving other parts in place, would cost 18 million people their insurance in the first year and could increase the number of uninsured Americans by 32 million in 10 years, while causing insurance premiums to double over that time.
The budget office analyzed the probable effects of a Republican repeal bill like the one approved in Congress but vetoed early last year by President Obama.
The C.B.O. report, released after a weekend of protests against repeal, will only add to the headaches that President-elect Donald J. Trump and congressional Republicans face in their rush to gut President Obama’s signature domestic achievement and try to replace it with a health law more to their liking.
The bill that the budget office analyzed would have eliminated tax penalties for people who go without insurance. It would also have eliminated spending for the expansion of Medicaid and subsidies that help lower-income people buy private insurance.
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