The non-partisan Congressional Budgetary Office (CBO) said the bill would reduce the budget deficit.
Similar legislation passed by the House was also said to leave millions uninsured. Some Republicans have voiced reservations about the plan.
However, the White House disputed the CBO’s figures.
Responding to the report, it said: “The CBO has consistently proven it cannot accurately predict how healthcare legislation will impact insurance coverage.”
The report is a review of draft legislation unveiled by the Republican Party last week.
It is unlikely to be approved by Democrats, who see the proposals as cruel and unfair.
The CBO said that 15 million more people would be uninsured by 2018 under the proposed legislation than under current law, largely because the penalty for not having insurance would be eliminated.
President Donald Trump’s party is struggling to secure the 50 votes it needs to get its bill through the Senate when it comes to the floor.
The Senate bill would slash taxes for the wealthy offering less help for working families to buy medical insurance.
Republicans have rejected the notion that anyone will die as a result of their healthcare plan.
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