Hundreds of thousands of immigrants with legal status are at risk of losing government health coverage starting Oct. 1, state data shows, signaling that the impact of Medicaid changes in President Donald Trump’s signature legislation from 2025 may be greater than anticipated.

Many lawfully present immigrants will be among the first people to lose Medicaid coverage under congressional Republicans’ One Big Beautiful Bill Act, which is expected to cut spending by more than $900 billion through 2034 for the state-federal health program for people with low incomes or disabilities. The law will strip many more immigrants of their Affordable Care Act plan subsidies and Medicare coverage next year.