Medicare was created by Congress in 1965 as part of the Social Security Act

Medicare did not exist before 1965. President Lyndon B. Johnson signed the Social Security Act Amendments into law on July 30, 1965, establishing Medicare as a federal health insurance program for people aged 65 and older. The program grew out of decades of debate about whether the federal government should help pay for medical care, and it passed during a period when Democrats held strong majorities in both the House and Senate.

The law was written by Congress, debated in committee, and shaped by input from the American Medical Association, hospital groups, insurance companies, and labor unions. No single person "invented" Medicare — it was the product of political negotiation, public pressure, and competing interests over how to structure a national health program. The result was a compromise that satisfied enough groups to become law, though it did not satisfy everyone.

Key Takeaways

  • Congress passed Medicare in 1965 as an amendment to the Social Security Act, and President Johnson signed it into law on July 30 of that year.
  • The program was designed to cover people aged 65 and older, and it was expanded in 1972 to include some younger people with disabilities and people with end-stage renal disease.
  • The Centers for Medicare & Medicaid Services (CMS), a federal agency within the Department of Health and Human Services, runs Medicare today.
  • Medicare Part A (hospital insurance) and Part B (medical insurance) were the original two parts; Parts C and D were added later as Congress changed the program.

Why Congress created Medicare in 1965

Before Medicare, most people over 65 had no health insurance. Medical costs were rising, and many older adults could not afford hospital stays or doctor visits. Surveys showed that elderly people were going without care because they could not pay, and their adult children were often bankrupted by their parents' medical bills.

The idea of federal health insurance for older people had been discussed since the 1930s, but it faced strong opposition from the American Medical Association and from Republicans who saw it as government overreach. By the early 1960s, public support had grown, and President Johnson made it a priority. The political moment aligned: Democrats had won the 1964 election by a large margin, and the public was sympathetic to the problem of elderly poverty and medical debt.

Congress also created Medicaid at the same time — a separate program for low-income people of any age — because lawmakers wanted to address medical costs across multiple groups. Medicare and Medicaid were two different solutions to two different problems, passed in the same law.

How the federal government structured Medicare

Congress decided that Medicare would be a federal program, not run by the states. This meant that may be able to access, benefits, and payment rules would be the same everywhere in the country. Congress also decided that Medicare would be insurance, not charity — people would pay into it through payroll taxes during their working years, and then draw on it after age 65. This framing made it politically easier to pass, because it resembled Social Security, which was already popular.

The original law created two parts. Part A covered hospital stays, skilled nursing facility care, and some home health services. Part B covered doctor visits, outpatient care, and other medical services. People had to pay a monthly premium for Part B, but Part A was free to anyone who had paid into Social Security for at least 10 years.

Congress set up the program to be run by the federal government, but it contracted with private insurance companies to process claims and handle the paperwork. This hybrid model — federal rules and funding, private administration — has remained largely the same for nearly 60 years.

Who runs Medicare today

The Centers for Medicare & Medicaid Services (CMS) is the federal agency that oversees Medicare. CMS is part of the Department of Health and Human Services. CMS sets the rules for what Medicare covers, how much it pays doctors and hospitals, and who is may be able to access. CMS also works with private insurance companies called Medicare Administrative Contractors (MACs) to process claims in different regions of the country.

When you call Medicare with a question, you are calling a CMS contractor, not CMS itself. When your doctor submits a claim, it goes to a MAC in your region. CMS writes the policy, but the day-to-day work of running the program is shared between federal employees and private contractors.

How Medicare changed after 1965

Congress has amended Medicare many times since 1965. In 1972, the program was expanded to cover people under 65 who had been receiving Social Security disability benefits for at least two years, and people of any age with end-stage renal disease (permanent kidney failure requiring dialysis). This was a major shift — Medicare was no longer only for older people.

In 1997, Congress created Medicare Part C, also called Medicare Advantage. This allowed private insurance companies to offer an alternative to traditional Medicare. Instead of going to any doctor who accepts Medicare, you would join a private plan that acted like an HMO or PPO. Part C has grown significantly and now covers about 28 percent of Medicare beneficiaries.

In 2003, Congress created Medicare Part D, which covers prescription drugs. Before Part D, Medicare did not pay for medications at all. The law required private insurance companies to offer drug plans, and Medicare subsidized the premiums for low-income beneficiaries. Part D is optional, but if you do not sign up when you first become may be able to access, you may pay a penalty for the rest of your life.

The role of Congress in ongoing Medicare decisions

Congress still controls Medicare. Every change to what Medicare covers, how much it pays providers, or who is may be able to access requires an act of Congress. CMS can make smaller decisions about how to implement the law, but major policy changes come from Congress.

This means that Medicare's future depends on political decisions made in Washington. When there is debate about whether to lower the may be able to access age, raise premiums, add new benefits, or change how much doctors are paid, that debate happens in Congress. Understanding who created Medicare — and who still controls it — helps explain why Medicare changes slowly and why different groups lobby Congress to shape those changes.

Frequently Asked Questions

Did President Johnson create Medicare by himself?

No. President Johnson supported Medicare and pushed Congress to pass it, but Congress wrote the law. The bill was drafted by committees in the House and Senate, debated by hundreds of lawmakers, and shaped by negotiations with interest groups. Johnson signed it, but Congress created it.

Why did it take until 1965 to create Medicare?

The idea had been discussed since the 1930s, but the American Medical Association and conservative lawmakers opposed federal health insurance for decades. Public support grew in the 1950s and early 1960s as medical costs rose and more elderly people lived in poverty. The 1964 election gave Democrats the votes they needed to pass it.

Is Medicare the same in every state?

Yes. Because Medicare is a federal program, the rules, benefits, and may be able to access are the same nationwide. However, the amount Medicare pays doctors and hospitals varies slightly by region, and private Medicare Advantage plans differ by state. Traditional Medicare itself is uniform.

Can Congress change Medicare without asking beneficiaries?

Yes. Congress can change Medicare benefits, premiums, or may be able to access rules through legislation. Beneficiaries do not vote on changes. However, proposed changes to Medicare are usually debated publicly, and beneficiary groups and medical organizations often testify before Congress about how changes would affect them.

Who decided Medicare would be run by the federal government instead of the states?

Congress made that decision when writing the 1965 law. A federal program meant uniform rules everywhere, which was seen as fairer and simpler than letting each state run its own program. This was different from Medicaid, which Congress designed as a state-federal partnership where states have more flexibility.