Physicians' Participation In Medicaid Increased Only Slightly Following Expansion.

While most primary care physicians treated at least one Medicaid patient in 2013, Medicaid represented a small share of their payer mix. Following Medicaid eligibility expansion in 2014, most physicians maintained or slightly increased their Medicaid participation, with greater increases observed in states that expanded eligibility. Nevertheless, Medicaid patients remained concentrated among relatively few physicians after expansion.