Medicare and Medicaid are two separate government programs with different rules, funding, and who they serve

Medicare and Medicaid sound similar, but they are completely different programs. Medicare is a federal insurance program run by the Centers for Medicare & Medicaid Services (CMS). It is based on age, disability status, or end-stage renal disease — not income. Medicaid is a joint federal and state program that covers low-income individuals and families, and the rules vary by state.

The confusion is understandable: both are government health programs, both are administered by CMS, and both can cover hospital and doctor visits. But they have separate enrollment systems, separate may be able to access rules, and separate payment structures. You may be covered by one, both, or neither — and which one you have changes what you pay and where you can go for care.

Key Takeaways

  • Medicare is based on age (65 and older), disability, or kidney disease; Medicaid is based on income and varies by state.
  • Medicare is funded by federal payroll taxes and is the same nationwide; Medicaid is jointly funded by federal and state money and has different rules in each state.
  • You can have both Medicare and Medicaid at the same time — this is called "dual coverage" and is common for people over 65 with low income.
  • If you turn 65, you must enroll in Medicare during your enrollment window or face permanent penalties on your premiums.
  • Medicaid coverage ends if your income rises above your state's limit, but Medicare continues as long as you remain enrolled.

How Medicare and Medicaid differ in who they cover

Medicare covers people who are 65 or older, regardless of income. It also covers some younger people: those on Social Security Disability Insurance (SSDI) for at least two years, and people with end-stage renal disease or ALS. Your income does not matter. If you meet the age or disability requirement, you can enroll.

Medicaid covers low-income individuals and families. The income limit depends on your state and your household size. Some states are more generous than others — a single person might may have access to in one state but not in a neighboring state. Medicaid also covers pregnant people, children, parents, and elderly or disabled adults, but the exact rules are set by each state.

The key difference: Medicare asks "Are you old enough or disabled enough?" Medicaid asks "Are you poor enough?" You can be too rich for Medicaid but still enroll in Medicare. You can also have both at the same time if you are 65 or older and have low income.

Who pays for each program and how premiums work

Medicare is funded by federal payroll taxes (the Medicare tax you see on your paycheck). When you turn 65, you pay a monthly premium for Part B (doctor visits and outpatient care), and you may pay premiums for Part D (prescription drugs) or a Medigap or Medicare Advantage plan. The premium amount is the same everywhere in the country, though it changes each year.

Medicaid is funded by both federal and state taxes. In most states, Medicaid has no monthly premium — you pay nothing to be covered. Some states charge a small monthly fee, and a few charge copays when you use services, but these are usually very low. Medicaid is free or nearly free to join.

If you have both Medicare and Medicaid (dual coverage), Medicare is your primary insurance and pays first. Medicaid pays second and often covers costs that Medicare does not, like long-term care and some copays.

Enrollment windows and what happens if you miss them

Medicare has strict enrollment periods. When you turn 65, you have a seven-month window to enroll in Part A (hospital insurance) and Part B (medical insurance). This window starts three months before your 65th birthday and ends three months after. If you miss this window and do not have other may have access to coverage, you pay a permanent penalty on your Part B premium for as long as you have Medicare.

Medicaid enrollment is ongoing in most states — you can explore any time your income or household situation changes. Some states have continuous enrollment; others have specific process periods. You should check your state's Medicaid website or call your state Medicaid office to learn the current rules.

If you are already on Medicaid and turn 65, you should enroll in Medicare during your initial enrollment window. Medicaid will then become your secondary coverage. Do not wait — missing the Medicare window costs you money for life.

What each program covers and what you pay out of pocket

Medicare Part A covers hospital stays, skilled nursing facility care, hospice, and some home health services. Part B covers doctor visits, lab tests, imaging, and outpatient procedures. Part D covers prescription drugs. You pay a deductible, copays, and coinsurance for most services. The exact amounts change each year.

Medicaid covers doctor visits, hospital care, emergency services, prescription drugs, and preventive care. Many state Medicaid programs also cover dental, vision, and hearing aids — benefits that Original Medicare does not. Copays are usually very low or zero. Long-term care (nursing home or home care) is covered by Medicaid in most states but not by Medicare.

If you have both programs, Medicare pays first, and Medicaid fills in gaps. This can mean you pay very little out of pocket for covered services.

What happens to your coverage if your income or age changes

Medicare coverage does not change based on income. Once you are enrolled, you stay enrolled as long as you pay your premiums and remain a U.S. citizen or permanent resident. Your coverage continues even if you become wealthy.

Medicaid coverage can end if your income rises above your state's limit. If you get a job, a raise, or a lump sum of money, you may lose Medicaid. Some states have a grace period or allow you to keep coverage for a few months after your income changes, but you should report income changes right away to avoid overpayment or sudden loss of coverage.

If you have both Medicare and Medicaid and lose Medicaid because your income rose, you keep Medicare. You will then pay more out of pocket for services that Medicaid was covering.

How to find out which program you have or whether you may have access to

To learn about Medicare, visit Medicare.gov or call 1-800-MEDICARE (1-800-633-4227). You can also visit your local Social Security office. They can tell you whether you are enrolled, what parts you have, and what your premiums and deductibles are.

To learn about Medicaid, contact your state Medicaid office. Each state has a different name for its program (some call it Medi-Cal, BadgerCare, or Healthy Families), and each has its own website and phone number. You can find your state's Medicaid office through the Centers for Medicare & Medicaid Services website or by calling 211.

If you think you might have both programs, your Medicare card and your Medicaid card will look different. Medicare cards are issued by the federal government and have your name and a Medicare number. Medicaid cards are issued by your state and have your state's name on them.

Frequently Asked Questions

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

Yes. If you are 65 or older and have low income, you may have both. This is called dual coverage or being "dually may be able to access." Medicare is your primary insurance and pays first; Medicaid pays second and often covers costs Medicare does not. Many people over 65 with limited income have both programs.

If I am on Medicaid now, do I automatically get Medicare when I turn 65?

No. You must enroll in Medicare yourself during your initial enrollment window — three months before to three months after your 65th birthday. Medicaid does not automatically switch you to Medicare. If you miss the window, you will pay a permanent penalty. Contact Social Security or Medicare.gov to enroll.

What if my state does not have a generous Medicaid program?

Medicaid rules vary widely by state. Some states cover more people and services than others. If your state's Medicaid program does not cover something you need, you may have other options: Medicare (if you are 65 or older or disabled), marketplace insurance through Healthcare.gov, or community health centers that offer sliding-scale fees based on income.

Will I lose Medicare if my income goes up?

No. Medicare is not based on income, so your coverage continues no matter how much money you earn. However, if you also have Medicaid and your income rises above your state's limit, you will lose Medicaid. You will then pay more out of pocket for services that Medicaid was covering.

How do I know if I may have access to for Medicaid in my state?

Income limits and rules vary by state. Contact your state Medicaid office directly — you can find the number through 211 or the Centers for Medicare & Medicaid Services website. They can tell you the current income limit for your household size and whether you meet other requirements.