In states that have not expanded Medicaid, about 24.9% of adults between the ages of 18 and 64 have a mental health problem or addiction disorder. The prevalence is higher, 28%, among low-income uninsured adults ages 18 to 64 in non-expansion states who have income below 138% of the Federal Poverty Level (FPL). In 2014, the 28% represented an estimated 1.9 million low-income uninsured people with a substance use disorder or a mental illness living in states that have not yet expanded Medicaid. Nationwide, from 2010 to 2014, among adults 18-64 living in the . . .