Medicaid is the single largest source of health coverage in the United States. In order to participate in Medicaid, federal law requires states to cover certain groups of individuals. Click here to see if your state has expanded Medicaid coverage to low-income adults.Seniors & Medicare and · Medicaid and CHIP Eligibility · Estate Recovery. Medicaid & CHIP basics. In all states, Medicaid provides coverage for some low-income people, families and children, pregnant women, the elderly, and people with disabilities. In some states, Medicaid has been expanded to cover all adults below a certain income level.Medicaid and CHIP Program · Using your new Medicaid or · CHIP.