Medicare started in 1965 and covers people 65 and older; Medicaid started the same year and covers low-income people of any age

Both programs launched on July 1, 1965, as part of President Lyndon B. Johnson's Great Society legislation. Medicare was designed specifically for people 65 and older, regardless of income. Medicaid was designed for people with low incomes, regardless of age. The two programs are separate — they have different rules, different funding sources, and different may be able to access paths — but they were born from the same law and signed on the same day.

Understanding when and why these programs began helps explain why they work the way they do today. The structure you encounter now — the way Medicare divides into parts, the way Medicaid varies by state — traces directly back to how Congress designed them in 1965.

Key Takeaways

  • Medicare and Medicaid both began July 1, 1965, under the Social Security Act Amendments, but they serve different populations and operate under different rules.
  • Medicare was created to cover hospital and medical costs for people 65 and older, while Medicaid was created to cover low-income people of any age.
  • The two programs are funded differently: Medicare comes from payroll taxes and premiums, while Medicaid is funded jointly by federal and state governments.
  • Medicaid rules vary significantly by state because each state designs and runs its own program within federal guidelines, which is why coverage differs depending on where you live.

Why Congress created Medicare in 1965

Before 1965, most people over 65 had no health insurance. Private insurers did not want to cover older people because they cost more to insure. Seniors often chose between paying for medical care and paying for food or housing. Hospital stays could wipe out a lifetime of savings.

Congress passed Medicare to solve that problem. The program was built on the idea that people who had worked and paid taxes their whole lives deserved coverage in retirement. Medicare Part A covers hospital stays, skilled nursing, and hospice. Medicare Part B, added at the start, covers doctor visits and outpatient care. The program launched with roughly 9 million people enrolled.

Why Congress created Medicaid in 1965

Medicaid was created to cover people living in poverty who had no insurance at all — not just older people, but children, pregnant women, people with disabilities, and working-age adults with very low incomes. Unlike Medicare, which is a federal program with the same rules everywhere, Medicaid was designed as a partnership between the federal government and each state.

This partnership structure meant states could set their own income limits, decide which services to cover, and determine how much to pay doctors and hospitals. That flexibility was intentional, but it also created the variation you see today: a person who qualifies for Medicaid in one state might not may have access to in another, and the services covered can differ significantly.

How the programs have changed since 1965

Medicare expanded in 1972 to cover people under 65 with end-stage renal disease (permanent kidney failure) and people under 65 receiving Social Security Disability Insurance for at least two years. In 2003, Congress added Medicare Part D to cover prescription drugs, which had not been part of the original design.

Medicaid has expanded unevenly. In 2014, the Affordable Care Act allowed states to expand Medicaid to cover more low-income adults, but the Supreme Court made that expansion optional. As a result, some states expanded and some did not, which is why Medicaid coverage for working-age adults varies dramatically by location. A person earning $15,000 a year might may have access to in one state and not in another.

The funding difference between Medicare and Medicaid

Medicare is funded primarily through payroll taxes — both you and your employer pay into it while you work — plus monthly premiums you pay once you are enrolled. Because it is funded this way, it is a federal program with consistent rules across all 50 states.

Medicaid is funded jointly by the federal government and each state. The federal government pays a percentage of the cost (the percentage varies by state based on income levels), and the state pays the rest. This shared funding is why states have so much power to set their own rules. A state that wants to cover more people or more services can choose to spend more state money, and vice versa.

Why the 1965 design still shapes Medicare and Medicaid today

The original structure created a lasting split. Medicare is a single national program that works the same way whether you live in Maine or California. Medicaid is 50 different programs that happen to share a name and some federal rules. When you turn 65, you enter Medicare automatically (if you have worked long enough). When you need Medicaid, you must understand your state's specific rules.

This design also explains why Medicare has Parts A, B, C, and D, each with different enrollment periods and different costs. Congress added pieces over time rather than redesigning the whole system. The result is a program that can feel complicated, but the pieces exist because they were added to solve specific problems as they arose.

Frequently Asked Questions

Did Medicare and Medicaid start on the same day?

Yes. Both programs began on July 1, 1965. They were created by the same law but serve different populations. Medicare covers people 65 and older. Medicaid covers low-income people of any age.

Why does Medicaid work differently in each state?

Medicaid was designed as a federal-state partnership from the beginning. Each state runs its own program within federal guidelines, sets its own income limits, and decides which services to cover. This is why a person might may have access to in one state but not another.

Was prescription drug coverage part of Medicare from the start?

No. Medicare Part D, which covers prescription drugs, was added in 2003. The original 1965 program covered hospital stays and doctor visits but not medications. Congress added drug coverage nearly 40 years later in response to rising prescription costs.

Can someone be on both Medicare and Medicaid?

Yes. People 65 and older with low incomes can be enrolled in both programs at the same time. These people are called "dual may be able to access." Medicaid typically covers costs that Medicare does not, like long-term care.

How many people were on Medicare when it started?

Approximately 9 million people enrolled in Medicare on its first day in 1965. Today, Medicare covers roughly 67 million people, including those 65 and older and younger people with disabilities or end-stage renal disease.