Learn About Medicare and Medicaid History

How Medicare and Medicaid Started: Two Different Programs, Same Era

Medicare and Medicaid both began in 1965, but they were created to solve different problems. Understanding where they came from helps explain why they work so differently today.

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Before 1965, millions of Americans had no way to pay for medical care. Older adults were especially vulnerable—about half of seniors had no health insurance at all. President Lyndon B. Johnson signed both programs into law on July 30, 1965, as part of his "Great Society" initiative. But the programs addressed two separate gaps in the healthcare system.

Medicare was designed specifically for people age 65 and older. Lawmakers recognized that seniors had higher medical costs but often couldn't find affordable insurance because insurers considered them too risky to insure. The program was built as a federal system—meaning the federal government runs it for everyone who meets the age requirement, regardless of income.

Medicaid, by contrast, was created to help low-income people of any age. Unlike Medicare, Medicaid is jointly run by the federal government and individual states. Each state designs its own Medicaid program within federal guidelines, which is why coverage and rules vary significantly from state to state. A person's Medicaid coverage in California might look quite different from coverage in Texas or Florida.

In 1965, Medicaid covered about 4 million people. Medicare launched with about 19 million beneficiaries. Today, these programs cover roughly 75 million Americans combined—a testament to how healthcare needs have grown over six decades.

Practical takeaway: Medicare and Medicaid are entirely separate programs with different histories, funding sources, and rules. Knowing which program might apply to your situation requires understanding these fundamental differences.

What Medicare Actually Covers: The Original Design and Modern Changes

Medicare's original design in 1965 included four basic parts, though the program has changed significantly over the decades. Understanding what each part covers—and what it doesn't—is essential for grasping how the program evolved.

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Part A covers hospital stays, skilled nursing care after hospitalization, hospice, and some home health services. When Medicare started, Part A was considered the core protection: if you needed to be admitted to a hospital, at least the government would help pay for it. Part B covers doctor visits, outpatient care, medical equipment, and preventive services. These two parts were the original foundation of Medicare when President Johnson signed it into law.

The program added Part D in 2006 to cover prescription drugs. By the early 2000s, medication costs had become a major burden for seniors, and Congress authorized this new coverage. Part D is administered through private insurance companies but with government subsidies and oversight.

Part C, also called Medicare Advantage, emerged gradually in the 1990s and 2000s. It allows people to receive their Medicare benefits through private insurance plans instead of the original government program. Medicare Advantage plans often include prescription drug coverage and sometimes dental or vision benefits, which original Medicare does not cover.

From the beginning, Medicare was never intended to cover everything. The program does not pay for routine dental care, vision exams, hearing aids, long-term care in nursing facilities, or most custodial care. Beneficiaries pay out-of-pocket costs called deductibles, copayments, and coinsurance amounts. This gap between what Medicare covers and what it costs has led millions of seniors to purchase supplemental insurance, often called Medigap plans.

In 2023, about 67 million people were enrolled in Medicare. Roughly 42 million used original Medicare (Parts A and B), while about 28 million chose Medicare Advantage plans. This shift toward private plans represents a major change from the program's original all-government model.

Practical takeaway: Medicare has five main components (Parts A, B, C, D, and supplemental coverage), but it does not cover all medical expenses. Knowing what Medicare does and doesn't cover helps explain why many seniors need additional coverage.

The Medicaid Story: A State-by-State Patchwork That Continues Evolving

Medicaid's history is more complicated than Medicare's because it was never meant to be a single national program. From day one, Medicaid was designed as a partnership between the federal government and states. The federal government sets minimum standards, but each state has significant freedom to design its own program. This flexibility was intentional, but it also created stark differences in who gets covered and what services are available.

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In the earliest years, Medicaid only covered people who received cash assistance from the government—essentially those in poverty who already qualified for welfare programs. Enrollment grew slowly. By 1975, only about 22 million people were enrolled in Medicaid across all states. Lawmakers gradually expanded the program to cover additional groups: pregnant women, children, elderly people in poverty, and people with disabilities.

The most significant modern change came with the Affordable Care Act in 2010. The law authorized the federal government to pay for states to expand Medicaid to cover more working-age adults, regardless of disability status, as long as their income fell below a certain threshold. However, a Supreme Court decision in 2012 made this expansion optional for states. As of 2024, 38 states and Washington D.C. have adopted Medicaid expansion, while 12 states have not. This means a person earning the same income might have Medicaid coverage in one state but not in another.

Medicaid enrollment fluctuates based on the economy and policy changes. During the COVID-19 pandemic, emergency federal funding kept people enrolled even if their circumstances changed. When this emergency period ended in March 2023, more than 15 million people lost Medicaid coverage in the following months—many because they were no longer eligible or failed to complete renewal paperwork. The size and scope of this "unwinding" showed how vulnerable Medicaid coverage can be.

Today, Medicaid covers roughly 72 million people and pays for many services that Medicare does not: dental care, vision care, long-term nursing home care, and transportation to medical appointments. For many low-income Americans and people with disabilities, Medicaid is the only health insurance they can access.

Practical takeaway: Medicaid's rules vary dramatically by state because states design their own programs. What Medicaid covers and who can access it depends heavily on where you live and major policy decisions made by your state government.

Major Turning Points: How These Programs Changed Over Time

Both programs have undergone significant changes since 1965, often driven by crises, political shifts, or attempts to control costs. These turning points shaped the programs that exist today.

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In the 1980s and 1990s, Congress became concerned about rising costs. For Medicare, this led to the creation of Diagnosis-Related Groups (DRGs) in 1983—a system that paid hospitals a set amount for each diagnosis rather than paying for each service. This was intended to discourage unnecessary tests and procedures. The approach did slow cost growth but also fundamentally changed how hospitals operated and how much they could charge for different procedures.

The Balanced Budget Act of 1997 created Medicare+Choice, the precursor to today's Medicare Advantage program. This allowed private insurance companies to compete for Medicare beneficiaries by offering alternative plans. The goal was to control costs through market competition. Over the following decades, Medicare Advantage grew from a small portion of the program to covering nearly half of all beneficiaries.

For Medicaid, the welfare reform of 1996 created a pivotal moment. It gave states even more authority to set their own Medicaid rules and funding formulas. This devolution of power to the states was politically motivated, but it meant that Medicaid became even more fragmented—a collection of 50 different programs rather than a single national one.

The Affordable Care Act of 2010 represented the largest Medicare and Medicaid change in decades. For Medicare, it introduced payment reforms, closed the "donut hole" gap in prescription drug coverage, and created incentives for providers to focus on quality and prevention. For Medicaid, it authorized the expansion discussed earlier and added new requirements for coverage of preventive services.

In 2023, Congress raised the age at which someone can enroll in Medicare from 65 to eventually reach 67 by 2031. This change applies only to people born in 1960 or later and represents a significant