What Is the Difference Between Medicare and Medicaid?

Key Takeaways

Medicare covers Americans 65+ and certain disabled people, regardless of income — it is an earned entitlement based on work history.

Medicaid covers low-income Americans of any age — it is means-tested and jointly funded by federal and state governments.

Together they cover over 150 million Americans — nearly half the country — making them the backbone of American healthcare coverage.

Republican budget plans have targeted Medicaid cuts (through block grants and work requirements) while Medicare cuts remain politically toxic.

AI Summary

Key takeaways highlight Medicare covers Americans 65+ and certain disabled people, regardless of income — it is an earned entitlement based on work history. Medicaid covers low-income Americans of any age — it is means-tested and jointly funded by federal and state governments. Together they cover over 150 million Americans — nearly half the country — making them the backbone of American healthcare coverage. Republican budget plans have targeted Medicaid cuts (through block grants and work requirements) while Medicare cuts remain politically toxic.

Medicare and Medicaid are two of the most consequential government programs in American history. They are constantly confused, constantly politically debated, and constantly misunderstood.

Here is what each one actually does.

Medicare: The Senior Entitlement

Medicare is health insurance for older Americans. You've been paying into it your entire working life — 1.45% of every paycheck, matched by your employer (2.9% total, with a higher rate on high incomes).

When you turn 65, you receive Medicare coverage regardless of your income, health status, or savings. That's the design: it's an earned entitlement, not welfare. You paid in; you receive the benefit.

Medicare has four parts:

Part A: Hospital insurance — covers inpatient hospital stays, skilled nursing facility care, hospice. Funded by your payroll taxes. Generally free (no premium) for those who worked enough years.
Part B: Medical insurance — covers doctor visits, outpatient care, preventive services, medical equipment. Funded by premiums ($174.70/month in 2024 for most beneficiaries) plus general revenue.
Part C: Medicare Advantage — private insurance plans that replace traditional Medicare, offered by approved insurers, often including drug coverage. Enrollment has been growing rapidly.
Part D: Prescription drug coverage — offered through private plans with federal subsidies.

About 65 million Americans are currently enrolled in Medicare.

Medicaid: The Safety Net

Medicaid is health coverage for Americans who can't afford private insurance, regardless of age. It is funded jointly by the federal government and states — the federal government pays between 50-90% depending on the state's wealth (poorer states get higher federal matching).

Each state runs its own Medicaid program within federal guidelines, which is why eligibility and coverage vary by state. A single adult in Texas may not qualify for Medicaid at any income level. A single adult in California may qualify up to 138% of the federal poverty level.

The Affordable Care Act created a Medicaid expansion allowing states to cover adults up to 138% of the federal poverty level with enhanced federal matching. 40 states and DC have adopted the expansion. 10 states have not, leaving millions of low-income adults in those states without coverage.

Medicaid covers approximately 90 million Americans — the largest source of health coverage in the country.

How They Interact: Dual Eligibles

About 12 million Americans qualify for both Medicare and Medicaid — "dual eligibles." These are typically low-income seniors or disabled people who have Medicare from their work history but whose income is so low that Medicaid pays their Medicare premiums, copays, and covers services Medicare doesn't.

Dual eligibles tend to have complex health needs and are among the most expensive people to cover in the health system. Managing their care is a major focus of both program reform efforts.

The Political Targets

The Republican approach to entitlement reform reflects a fundamental calculation: Medicare cuts are politically toxic (elderly voters turn out at high rates and are a core Republican constituency), while Medicaid cuts are more politically viable (the poor vote at lower rates and are a more Democratic constituency).

The House Republican budget reconciliation bill includes $880 billion in Medicaid cuts over 10 years through:

Work requirements for adults aged 18-55
More frequent eligibility redeterminations (catching people who technically no longer qualify sooner)
Shifting more costs to states through per-capita caps or block grants
Tightening eligibility rules

A block grant would give each state a fixed amount per year regardless of enrollment or medical costs — meaning recessions (which increase Medicaid enrollment) and medical cost inflation would force states to either cut eligibility or raise state taxes.

Medicare's long-term funding gap — its hospital trust fund faces insolvency around 2031 — is also real, but neither party has proposed comprehensive solutions, and any Medicare cuts would face a far more organized political resistance.

The practical reality: the people who depend most on Medicaid — low-income children, disabled adults, nursing home residents — are the least able to organize political resistance to cuts. The political math reflects that.

FAQ

What is the difference between Medicare and Medicaid?

Medicare is a federal health insurance program primarily for Americans 65 and older, plus certain disabled people and those with end-stage renal disease. It is funded by payroll taxes (Medicare tax of 1.45% from employee and employer) and premiums. Medicaid is a joint federal-state program providing health coverage to low-income Americans of all ages — children, pregnant women, disabled adults, and low-income seniors. Eligibility is based on income and category, not age or work history.

Who qualifies for Medicare?

You qualify for Medicare if: you are 65 or older and have worked at least 10 years in Medicare-covered employment (or are the spouse of such a person), you are under 65 with certain disabilities and have received Social Security Disability Insurance for 24 months, or you have end-stage renal disease or ALS (Lou Gehrig's disease) at any age. Medicare eligibility is not based on income — a wealthy 65-year-old and a poor 65-year-old both qualify.

Who qualifies for Medicaid?

Medicaid eligibility varies by state (each state administers its own program within federal guidelines). Generally, Medicaid covers: children up to income thresholds (varies by state), pregnant women, adults under 65 whose income is below 138% of the federal poverty level in states that accepted ACA expansion, people with disabilities, and low-income seniors (who may have both Medicare and Medicaid). About 22 states have expanded Medicaid under the ACA; some states have more restrictive eligibility.

Will Trump cut Medicare or Medicaid?

Trump has repeatedly promised not to cut Medicare benefits. He has also promised the same for Social Security and Medicaid in general campaign statements. However, the House Republican budget reconciliation bill includes significant Medicaid cuts through work requirements, cost-shifting to states, and eligibility restrictions. Medicare cuts remain politically toxic for both parties and are not a current focus of Republican budget proposals, though Medicare's long-term funding gap is real and unaddressed.