What’s the Difference Between Medicare and Medicaid?

Medicare and Medicaid are two of America’s largest health insurance programs, but they’re often mistaken for each other. “People don’t know the difference between them and use the terms interchangeably,” says Josh Hodges, the chief customer officer at the National Council on Aging.
What Is Medicare?
- Part A (hospital insurance): Covers inpatient hospital care, skilled nursing facility care, hospice care, and home healthcare.
- Part B (medical insurance): Covers doctor’s visits, outpatient care, home healthcare, durable medical equipment, and preventive services such as screenings, shots, and yearly wellness visits.
- Part C (Medicare Advantage): A type of Medicare health plan offered by a private company, but approved by Medicare. These plans provide Part A, Part B, and usually Part D.
- Part D (prescription drug coverage): Covers some or all of the cost of prescription drugs.
What Is Medicaid?
How Do Medicare and Medicaid Differ?
Both programs offer health insurance coverage, but they serve different people. Medicare generally provides coverage for people age 65 and older, whereas Medicaid provides coverage for people with limited income and resources.
Since Medicare is run by the federal government, coverage is the same no matter what state they live in; since Medicaid is run by the federal and state governments, the eligibility requirements can vary from state to state. Medicaid also tends to cover more services than Medicare.
How Do I Know Which Plan I’m Eligible For?
Medicare Eligibility
Age-Based Coverage If you are 65 or older and if you (or your spouse) paid Medicare taxes for at least 10 years (or 40 quarters), you automatically qualify for premium-free Medicare Part A. If you or a loved one didn’t pay enough Medicare taxes, you can still enroll, but will pay a premium for Part A.
Medicaid Eligibility
Age and Disability Coverage If you’re on Medicare, you may also qualify for Medicaid if your income and assets are low (meaning you have dual eligibility). That’s because Medicare doesn’t cover all your health insurance costs, so you can qualify for Medicaid on the basis of factors that include your household income and age.
Medicare Savings Programs (MSPs)
Where Do I Sign Up?
You can sign up for both Medicare and Medicaid online, or be automatically enrolled in Medicare Part A and B. While you can enroll in Medicaid year-round, you’re only able to enroll in Medicare during specific enrollment periods.
Medicare Enrollment
If you’re already getting Social Security or disability benefits, you’ll automatically be enrolled in Medicare Part A and Part B once you’re eligible for Medicare.
If you aren’t getting Social Security benefits or aren’t eligible for retirement, you can sign up by completing an application for Part A or by contacting Social Security though SSA.gov. You can also call 800-772-1213 to speak with a representative. Once you submit your application, you can also check the status of it online. You can sign up for Part C and Part D through Medicare.gov.
If you were a railroad employee, you can sign up through the Railroad Retirement Board.
You can only sign up for Medicare at certain times, though, including:
- Initial Enrollment Period (IEP) The 7-month period when you’re first eligible for Medicare: three months before your 65th birthday, the month of your birthday, and three months after your birthday
- General Enrollment Period (GEP) Between January 1 and March 31 each year
- Special Enrollment Period (SEP) A period occurs if you didn’t sign up for Medicare when you first became eligible because you already had health insurance coverage through your or your spouses’s employer.
Medicaid Enrollment
If you’re already getting SSI and live in Washington, DC, or one of the 34 participating states, you’ll automatically be enrolled in Medicaid.
If you’re not automatically enrolled in Medicaid, you can sign up anytime through your state Medicaid office or Healthcare.gov.
Is It Possible to Switch From Medicaid to Medicare?
Yes, you can switch between the two programs, especially in certain circumstances. These include:
- You turned 65. If you’re currently on Medicaid, you’ll automatically switch to Medicare for your primary insurance once you turn 65. Medicaid eligibility then changes from income-only to both income and asset limits. If you lose Medicaid while on Medicare, you have three months to join or change to a Medicare Advantage Plan with drug coverage or add Medicare Part D to your coverage. You can switch coverage starting from when you received notification of the change or as soon as your coverage ends, whichever is later.
- You turned 18 and no longer qualify for disabilities. Upon turning 18, young adults who were receiving Medicaid must requalify for disability benefits under stricter adult criteria. If you qualify for SSI, you’ll likely be able to receive Medicaid, too.
Could I Ever Lose My Benefits?
Yes. If you lie on your application or commit other fraudulent acts, you could lose coverage. Otherwise, there are a few main ways you could lose your Medicare or Medicaid benefits.
- You can’t pay your Medicare bills. If you fall 90 days behind on your Medicare Part B payments, you’ll receive a Delinquent Bill notice. At this point, you must pay the total amount due or risk losing your Medicare coverage. If you receive a termination notice, you have a 30-day grace period to pay what you owe and maintain your Part B coverage. If you miss payments for Medicare Parts C or D, your grace period will be at least 60 days. If you don’t, you risk losing your benefits. If you’re behind on payments because of financial hardship, you may be eligible for a special payment plan.
- There’s a change in your health status. If you’re eligible for Medicare only because you have ESRD, you’ll lose your coverage 12 months after you stop dialysis or 36 months after you receive a kidney transplant. Medicare does offer a benefit to help you pay for immunosuppressive drugs beyond 36 months, however. For Medicaid, you may lose eligibility if your disability status improves.
- You’re moving (or you recently moved). If you move outside your Medicare Part C (Medicare Advantage) or Part D plan’s service area, you must switch plans before or immediately after relocating to maintain coverage. If you move and don’t join a new Medicare Advantage Plan during this Special Enrollment Period, you’ll be enrolled in original Medicare when you’re dropped from your old Medicare Advantage Plan. Moving out of the country? Know that Medicare does not provide coverage outside the United States. As for Medicaid, because eligibility rules vary by state, you’ll need to reapply and may face different coverage requirements when you move.
- You experienced a change in income or household resources. If your income rises above your state’s Medicaid eligibility limit, if your savings and assets exceed a certain amount, or if there are changes to your household size, you may lose your Medicaid benefits. You must report these changes within 10 days; failing to do so can result in penalties.
People with limited income/resources
The Takeaway
- Medicare is a federal program primarily for those age 65 and older, while Medicaid is a federal and state program for those with limited income and resources.
- You can qualify for both Medicare and Medicaid if you meet certain eligibility requirements for each program.
- Medicare has certain enrollment windows, while Medicaid enrollment is open year-round.
- Changes to your health status, income, or state residence can affect your benefits, so report any of these changes right away to avoid a penalty.
Resources We Trust
- National Council on Aging: A Guide to Medicare and Medicaid
- KFF: 5 Key Facts About Medicaid Coverage for People With Medicare
- Center for Medicare Advocacy: Original Medicare (Part A and B) Eligibility and Enrollment
- Medicare: Medicare Costs
- U.S. Department of Health and Human Services: Who’s Eligible for Medicaid?
- KFF Health Tracking Poll February 2025: The Public’s Views on Potential Changes to Medicaid. KFF. March 7, 2025.
- Parts of Medicare. U.S. Centers for Medicare and Medicaid Services.
- What Is Medicare Part C? U.S. Department of Health and Human Services. July 22, 2024.
- What’s the Difference Between Medicare and Medicaid? U.S. Department of Health and Human Services (HHS). December 8, 2022.
- Seniors & Medicare and Medicaid Enrollees. Medicaid.gov.
- Who’s Eligible for Medicare? HSS. December 8, 2022.
- Which Path Is Right for Me? Medicare.gov.
- Medicare. Social Security Administration. 2025.
- Eligibility Policy. Centers for Medicare & Medicaid Services.
- Who’s Eligible for Medicaid? Health & Human Services. December 8, 2022.
- 2025 Federal Poverty Levels / Guidelines & How They Determine Medicaid Eligibility. American Council on Aging. January 17, 2025.
- Medicaid’s 2025 Financial and Functional Eligibility Requirements for Long-Term Care. Eldercare Resource Planning. March 26, 2025.
- Former Foster Care Children Medicaid Policy Update. Center for Medicare Advocacy (CMS). January 30, 2024.
- About the National Breast and Cervical Cancer Early Detection Program. Centers for Disease Control and Prevention. September 19, 2024.
- What Are Medicare Savings Programs (MSPs)? NCOA. May 14, 2025.
- 5 Things You Need to Know About Signing Up for Medicare. U.S. Centers for Medicare & Medicaid Services.
- Losing Medicaid? Medicare Coverage Could Be an Option. Medicare.gov. February 2023.
- HI 01001.100 Delinquent Notice. Social Security Administration; Program Operations Manual System (POMS). November 23, 2022.
- Medicare Coverage of Kidney Dialysis & Kidney Transplant Services. Medicare.gov. February 2025.
- What You Need to Know When You Get Supplemental Security Income (SSI). Social Security Administration. February 2025.
- Special Enrollment Periods. Medicare.gov.
- The Documentation Required to Verify Financial Eligibility for Long-Term Care Medicaid. ACOA. January 21, 2025.

Sarah Goodell, MA
Reviewer
Sarah Goodell is a health policy consultant with over 25 years of experience. She is currently working as an independent consultant focusing on the Affordable Care Act, Medicare, health financing, and health delivery systems.
She previously served as director of the Synthesis Project, funded by the Robert Wood Johnson Foundation. At the Synthesis Project she managed projects on a variety of topics, including risk adjustment, Medicaid managed care, hospital consolidation, the primary care workforce, care management, and medical malpractice.
Prior to her work as a consultant, Ms. Goodell spent five years as a policy analyst in the Office of the Assistant Secretary for Planning and Evaluation (ASPE) at the U.S. Department of Health and Human Services. Her work at ASPE focused on private insurance and patient protections, including external appeals processes and privacy.

Holly Pevzner
Author
Holly Pevzner is a writer who specializes in health, nutrition, parenting, and pregnancy. She is currently a staff writer at Happiest Baby. Her work, including essays, columns, features, and more, spans a variety of publications, websites, and brands, such as EatingWell, Family Circle, Fisher-Price, Parents, Real Simple, and The Bump. Pevzner has written several monthly health columns, including for First for Women and Prevention magazines. She previously held senior staff positions at Prevention, Fitness, and Self magazines, covering medical health and psychology. She was also a contributing editor at Scholastic's Parent & Child magazine.