State proposals to allow residents who don’t qualify for Medicaid to buy into the program are gaining steam, but providers are concerned that could cut deep into state budgets, drive physicians out of Medicaid’s already-skimpier networks and shift more costs to the commercial insurance market.

Providers’ worries about state Medicaid buy-in options are similar to their unease over the “Medicare for all” plan pushed by Sen. Bernie Sanders (I-Vt.), which is gaining steam with progressive Democrats in Congress.