evidence: Medicaid Expansion also gives the adopting states an enhanced federal matching assistance percentage (FMAP) for the populations served by the expansion. States with Medicaid Expansion receive 90% FMAP while those without Medicaid Expansion receive nothing. [...] This provides a pathway to coverage for millions of low-income adults in America. [...] Medicaid Expansion is a provision of the ACA designed to increase coverage for non-disabled adults under 65 who have low incomes. Currently, this program is only available in about 40 American states.