Some senators have suggested their preference to write a new bill, rather than working to amend the American Health Care Act.
A second type of waiver would allow insurers to set premiums on the basis of an individual's health status.
"This is unsustainable", she said in a statement.
"Comprehensive reproductive health care would still move out of reach, especially for millions of low-income people, because of this bill's attacks on Medicaid, Planned Parenthood and abortion coverage", Davis said.
In that vote, the new bill passed only narrowly in a 217-213 vote after Republicans were twice unable in March to collect enough votes to pass it. The agency estimated that about one-sixth of the population - more than 50 million people - live in states that would make substantial changes under the waivers.
Park explained that premiums will go down because they are weighted by what insurance companies believe people will enroll in.
The CBO's analysis of subsidies in 2026 indicates that under the GOP bill, net premiums for a 64-year-old earning $28,500 would rise from $1,700 to $13,600-$16,100, depending on whether the person lives in a waiver state. That would mean people would have to pay for those treatments on their own, or buy separate riders to cover them. But those are offset in large part by bigger costs, including the repeal of many of Obamacare's taxes.
"Despite the pleas of families across America and the urgent warnings of nearly every doctors' and patient group, Republicans are still pushing to enact this moral monstrosity", Pelosi added.
"We'll get 'em", Senate Finance Committee Chairman Orrin Hatch, R-Utah, said when asked if GOP leaders would round up the votes they'll need to pass a bill.
The legislation would still hit poor Americans the hardest. The CBO's bottom line is that the bill is still a train wreck that will cost millions of Americans their coverage and sharply raise costs for millions more. Republicans said they disagreed with the CBO projection released Wednesday.
Republicans on Capitol Hill and in the White House have criticized the CBO for inaccuracies in its analysis of the impact of the Affordable Care Act in 2010.
CBO said states adopting those waivers run the risk of destabilizing coverage for people with medical problems. "For all their efforts, they are clearly not prophets".
"Look, nobody wants folks who have a pre-existing illness or injury not to be covered", Trump administration Health and Human Services Secretary Tom Price said earlier this month.
As a candidate, Donald Trump said that the health care plan that he would sign as president would cover "everybody", and that for those who couldn't afford it "the government will pay for it".
In their scoring of the previous version, the Office said the bill would cut $337 billion from the federal budget deficit over 9 years, while premiums for individuals purchasing insurance would increase 15-20% in 2018 and 2019.
There are concerns that the House legislation could cause procedural obstacles for both chambers.
Senate Republicans still searching for a deal.
The implication was that the House might have to change its bill and pass it again - or even start over. The group is a non-profit, bipartisan policy organization that assesses budget and fiscal issues.
The latest CBO analysis came after House Republicans made changes to the bill earlier this month to try to ensure that people with pre-existing medical conditions can still get insurance. Later, MacArthur and leaders of the conservative Freedom Caucus negotiated changes that they said should help bring down premium costs for consumers.