MIAMI — Prospects for Medicaid expansion in Florida, which was embraced, improbably, by the state’s Republican governor in February, are all but dead this year.

With the Republican-dominated Legislature preparing to leave town on Friday, time has run out to draft a compromise bill between the House and Senate that would expand Medicaid with the help of billions of federal dollars. House Republicans voted last week to reject the Senate plan, which would take the federal money and use it to add low-income Floridians to private insurance plans.

The Legislature’s inability to agree means that more than a million low-income Floridians will remain without insurance, at least in the short term. Florida has one of the nation’s highest rates of uninsured people. Public hospitals also will suffer because they will continue to have to care for those one million uninsured who seek treatment in their emergency rooms.

Florida must have a plan to expand coverage passed and approved by the federal government as of Jan. 1, 2014, or it will lose an estimated $1 billion in Medicaid dollars in the first year. The federal government will fully finance the new enrollees for the first three years.