Medicaid is a joint federal and state government program in the United States that provides healthcare coverage to eligible low-income individuals and families. It is the largest source of health insurance for low-income Americans and serves various demographic groups, including children, pregnant women, parents, seniors, and individuals with disabilities.

Each state administers its own Medicaid program within federal guidelines, determining eligibility criteria, covered benefits, and provider reimbursement rates. Medicaid covers a wide range of medical services, including hospitalization, physician visits, long-term care, prescription drugs, and preventive care. Funding for Medicaid comes from both federal and state governments, with federal contributions varying based on state-specific factors like per capita income.