The Current Size of Medicare

As of 2024, more than 67 million people in the United States have Medicare coverage. That number includes people age 65 and older, younger people with disabilities, and people with end-stage renal disease. The program has grown steadily since it began in 1965, and the number continues to rise as the population ages.

Medicare is the largest health insurance program in the country. It covers more people than any single private insurance company and more than most state Medicaid programs. Understanding how many people rely on Medicare helps explain why changes to the program affect so many households.

Key Takeaways

  • More than 67 million people currently have Medicare coverage, making it the largest federal health insurance program.
  • About 9 in 10 Medicare enrollees are age 65 or older, while roughly 1 in 10 are younger people with disabilities or specific medical conditions.
  • Medicare enrollment has grown by millions over the past decade and is expected to keep growing as more people reach age 65.
  • The number of people on Medicare varies slightly by state, with some states having much higher enrollment than others.

Who Makes Up the Medicare Population

The majority of Medicare enrollees — about 60 million people — are age 65 and older. These are people who became may be able to access when they turned 65, regardless of their income or health history. This group includes people who worked long enough to earn Medicare through their own work history or their spouse's work history.

The remaining roughly 7 million Medicare enrollees are younger than 65. This group includes people who have been on Social Security Disability Insurance (SSDI) for at least two years, people with end-stage renal disease who need dialysis or a transplant, and people with amyotrophic lateral sclerosis (ALS), also called Lou Gehrig's disease. These younger enrollees became may be able to access for Medicare through a medical condition rather than age.

How Medicare Enrollment Has Changed

Medicare enrollment has grown significantly over the past 15 years. In 2010, the program covered about 47 million people. By 2024, that number had grown to more than 67 million — an increase of roughly 20 million people in just over a decade.

Much of this growth comes from the aging of the Baby Boomer generation. As more people born between 1946 and 1964 reach age 65, they become may be able to access for Medicare. Enrollment is expected to continue growing over the next several years. The Centers for Medicare and Medicaid Services (CMS) projects that by 2030, Medicare will cover more than 80 million people.

Medicare Enrollment by State

The number of Medicare enrollees varies widely by state. States with larger populations and higher concentrations of older adults have more Medicare beneficiaries. California has the highest enrollment, with more than 6 million Medicare beneficiaries. Florida, Texas, New York, and Pennsylvania also have very large Medicare populations, each with more than 3 million enrollees.

Smaller states have proportionally fewer enrollees. Wyoming, Vermont, and Alaska each have fewer than 150,000 Medicare beneficiaries. However, some smaller states have a higher percentage of their total population on Medicare because they have older populations overall. Understanding your state's enrollment can help you see how Medicare affects your community's healthcare system.

The Breakdown of Medicare Coverage Types

Not all Medicare enrollees have the same type of coverage. About 42 million people have Original Medicare, which is the traditional fee-for-service program run directly by the federal government. These enrollees receive coverage through Medicare Part A (hospital insurance) and Part B (medical insurance).

The remaining roughly 25 million Medicare enrollees are in Medicare Advantage plans, also called Part C. These are private insurance plans that contract with Medicare to provide coverage. Medicare Advantage plans often include prescription drug coverage and additional benefits like dental or vision, which Original Medicare does not cover.

Many enrollees in both Original Medicare and Medicare Advantage also have prescription drug coverage through Part D plans. The exact numbers shift each year during the annual enrollment period, when people can change their coverage type.

Why These Numbers Matter

The size of the Medicare population affects healthcare policy, insurance costs, and hospital resources across the country. When Medicare makes changes to how it pays doctors or hospitals, those changes affect millions of people and thousands of healthcare providers. When drug prices rise, the impact on Medicare spending influences what the program can afford to cover.

For individuals, knowing that you are part of a program serving 67 million people means you have access to a large network of doctors and hospitals. It also means that your coverage decisions — which plan to choose, whether to add prescription drug coverage, when to switch plans — are decisions that millions of other people are making at the same time.

Frequently Asked Questions

Is Medicare enrollment still growing?

Yes. Enrollment grows each year as more people reach age 65 and as the Baby Boomer generation continues to age into the program. The Centers for Medicare and Medicaid Services expects enrollment to reach 80 million by 2030, though the exact rate of growth depends on birth rates and life expectancy.

Do all 67 million Medicare enrollees have the same coverage?

No. About 42 million have Original Medicare (Parts A and B), while 25 million are in Medicare Advantage plans. Additionally, some enrollees have supplemental coverage, and many have prescription drug plans. The type of coverage varies based on individual choices and enrollment decisions.

Why do some states have so many more Medicare enrollees than others?

States with larger total populations naturally have more Medicare enrollees. Additionally, states with older populations — like Florida and Arizona — have higher percentages of residents on Medicare. Migration patterns also matter; some states attract retirees, which increases their Medicare enrollment.

Does the number of people on Medicare affect my coverage or costs?

Indirectly, yes. The size of the Medicare population influences how much the program spends overall, which can affect policy decisions about coverage and payment rates. However, your individual coverage and out-of-pocket costs depend on your specific plan, not on total enrollment numbers.