Unfortunately, the portion of the ACA requiring states to expand medicaid was ruled unconstitutional. As a result, 19 states have choosen not to expand medicaid, leaving a portion of the population to poor to qualify for ACA subsidies, but too rich to qualify for medicaid.

I should also point out, that the medicade expansion is 90% funded by the federal government starting from 2020 into perpetuity. Prior to then is a ramp up period where the federal government pays an even larger share.