The Core Difference: Who Pays and Who Gets Covered

Medicare is a federal insurance program you pay into through payroll taxes during your working years. You become covered at 65, regardless of income. Medicaid is a joint federal and state program that covers people with low income, regardless of age. The programs serve different populations and work in completely different ways.

Medicare is an earned benefit — you may have access to because you or your spouse worked and paid Medicare taxes for at least 10 years. Medicaid is a need-based program — you may have access to because your income and assets fall below your state's limits. A person can be on both programs at the same time, which is called "dual coverage."

The confusion happens because both are government health insurance, both use the word "care," and both cover hospital and doctor visits. But they are run by different agencies, funded differently, and have different rules about who pays what.

Key Takeaways

  • Medicare covers people 65 and older, plus some younger people with disabilities or end-stage renal disease, and is funded through payroll taxes you paid while working.
  • Medicaid covers people with low income and assets, at any age, and is funded by federal and state taxes, with rules that vary by state.
  • Medicare has the same rules nationwide; Medicaid rules, income limits, and covered services differ significantly from state to state.
  • You can be on both Medicare and Medicaid at the same time if you meet the income and age requirements for each.
  • Medicare requires you to pay premiums, deductibles, and copays; Medicaid typically has lower or no out-of-pocket costs for people with very low income.

Who Medicare Covers

You are covered by Medicare if you are 65 or older and you or your spouse worked for at least 10 years while paying Medicare taxes. You do not have to be retired — you can still be working. Your income does not matter for Medicare may be able to access.

Some people under 65 also may have access to: those who have received Social Security Disability Insurance (SSDI) for 24 months, those with end-stage renal disease (ESRD), and those with amyotrophic lateral sclerosis (ALS). If you are under 65 and disabled, you must have been receiving SSDI for two years before Medicare begins.

You must sign up for Medicare during your enrollment window. If you turn 65, your initial enrollment period is three months before the month you turn 65, the month itself, and three months after. If you miss this window, you may pay a penalty for the rest of your life.

Who Medicaid Covers

Medicaid covers people with low income and limited assets. The exact income and asset limits vary by state and change each year. In most states, a single adult with income below 138% of the federal poverty line may be covered, but some states have set their limits lower. A few states have set them higher.

Medicaid covers people of any age — children, working-age adults, pregnant people, parents, and seniors. You do not have to be disabled to may have access to. Some states have expanded Medicaid to cover more people; others have not. Your state's rules determine whether you are covered.

Unlike Medicare, Medicaid is not automatic. You must explore through your state's Medicaid office or through Healthcare.gov. The process and timeline vary by state. Some states process applications in days; others take weeks.

How the Programs Pay for Care

Medicare is funded by payroll taxes: 1.45% from employees and 1.45% from employers, plus an additional 0.9% from high earners. These taxes go into a trust fund that pays for covered services. When you use Medicare, you typically pay a monthly premium for Part B (doctor visits), an annual deductible, and copays or coinsurance for each service.

Medicaid is funded by federal and state income taxes. States manage their own Medicaid programs within federal guidelines, so the amount of money available varies. In states with more funding, Medicaid may cover more services and have lower out-of-pocket costs. In states with less funding, coverage may be narrower.

Medicare is the same program nationwide — your coverage in Florida is the same as in Oregon. Medicaid is not. Your coverage in one state may not transfer if you move to another state.

What Each Program Covers

Medicare covers hospital stays (Part A), doctor visits and outpatient care (Part B), prescription drugs (Part D), and optionally managed care plans (Part C). It does not cover dental, vision, hearing aids, or long-term custodial care. If you need these services, you can buy a supplemental policy (Medigap) or a Medicare Advantage plan that includes them.

Medicaid covers hospital stays, doctor visits, emergency care, and prescription drugs in all states. Beyond that, coverage varies. Most states cover dental for children but not adults. Some states cover vision; others do not. Some cover hearing aids; others do not. Long-term care coverage varies widely — some states cover nursing home care for people who meet income and asset limits; others do not.

Because Medicaid rules differ by state, the best way to know what your state covers is to contact your state Medicaid office or visit your state's Medicaid website. The federal government maintains a list of state Medicaid offices on Medicaid.gov.

Out-of-Pocket Costs

Medicare requires you to pay premiums, deductibles, and copays. Part B premium is currently $164.90 per month for most people (higher if your income is above a certain level). The Part B deductible is $240 per year. After that, you typically pay 20% of the cost of covered services. Prescription drug coverage (Part D) has its own premium and deductible.

Medicaid typically has much lower out-of-pocket costs. For people with very low income, Medicaid may have no premiums, no deductibles, and no copays. For people with slightly higher income, some states charge small copays — usually $1 to $5 per visit. Medicaid cannot charge copays for emergency services, family planning, or preventive care.

If you are on both Medicare and Medicaid (dual coverage), Medicaid usually pays your Medicare premiums and deductibles, and you may have no out-of-pocket costs at all.

How to Enroll

To enroll in Medicare, you do not explore — you are automatically enrolled in Part A (hospital insurance) if you are receiving Social Security benefits at 65. If you are not receiving Social Security, you must contact Social Security to enroll. You can enroll online at ssa.gov, by phone at 1-800-772-1213, or in person at a Social Security office.

To enroll in Part B (doctor visits) and Part D (prescription drugs), you can use Medicare.gov or call 1-800-MEDICARE. Your initial enrollment period is the same three-month window mentioned above. If you miss it and do not have other coverage, you will pay a penalty.

To explore for Medicaid, contact your state's Medicaid office or explore through Healthcare.gov. The process asks about your income, household size, and assets. Processing time varies by state but typically takes two to four weeks. Some states allow you to explore online; others require a paper process or in-person interview.

Frequently Asked Questions

Can I have both Medicare and Medicaid at the same time?

Yes. If you are 65 or older and your income is low enough to meet your state's Medicaid limits, you can be on both. This is called dual coverage or "Medi-Medi." Medicaid will typically pay your Medicare premiums and deductibles, reducing your out-of-pocket costs significantly.

What happens to my Medicaid if I move to another state?

Your Medicaid coverage ends when you move. You must explore for Medicaid in your new state, and the rules and income limits may be different. You should explore before your current coverage ends to avoid a gap. Medicare, however, follows you — your coverage is the same in every state.

Do I have to pay back Medicaid if my income increases?

No. Medicaid is not a loan. If your income increases and you are no longer covered, you straightforward lose coverage going forward. You do not owe money for the care you received while you were covered. However, some states have estate recovery programs that try to recover costs from your estate after you die if you were over 55 when you received long-term care.

Can I use my Medicare in other countries?

Medicare generally does not cover care outside the United States, except in limited cases in Canada and Mexico near the border. If you travel internationally, you may want to buy supplemental travel insurance. Medicaid does not cover care outside your state, let alone outside the country.

What if I do not sign up for Medicare at 65?

If you miss your initial enrollment period and do not have other may have access to coverage, you will pay a permanent penalty on your Part B and Part D premiums — 10% more for each year you were late. The penalty lasts for the rest of your life, so it is important to enroll on time even if you are still working.