Medicaid provides health coverage to more than 4.6 million low-income seniors, nearly all of whom are also enrolled in Medicare. Medicaid also provides coverage to 3.7 million people with disabilities who are enrolled in Medicare. In total, 8.3 million people are “dually eligible” and enrolled in both Medicaid and Medicare, composing more than 17% of all Medicaid enrollees. Individuals who are enrolled in both Medicaid and Medicare, by federal statute, can be covered for both optional and mandatory categories.