Medicare is federal health insurance based on age or disability. Medicaid is a joint federal and state program based on income. That single distinction, who you are versus what you earn, drives every other difference between the two programs, from what they cover to what you pay. Many people confuse them because the names are nearly identical, but they work very differently.
Who Qualifies for Each Program
Medicare is available to everyone 65 and older, regardless of income. You can also qualify before 65 if you have certain disabilities or conditions. Most people are automatically enrolled when they turn 65 if they’re already receiving Social Security benefits. Your income has nothing to do with eligibility.
Medicaid works on the opposite principle. It’s designed for people with limited income and, in some cases, limited assets. The federal government sets baseline rules, but each state runs its own Medicaid program with its own income thresholds and eligibility requirements. This means you might qualify in one state but not another. Medicaid covers low-income adults, children, pregnant women, elderly individuals, and people with disabilities.
How They’re Funded and Managed
Medicare is entirely federal. The Centers for Medicare & Medicaid Services runs the program, and the rules are the same whether you live in Texas or Maine. You pay into it through payroll taxes during your working years, and premiums come out of your Social Security check once you’re enrolled.
Medicaid splits costs between the federal government and individual states. Because states have significant control over their programs, benefits, covered services, and eligibility criteria can look quite different depending on where you live.
What Medicare Covers
Medicare is divided into parts, each handling a different category of care. Part A covers inpatient hospital stays, skilled nursing facility care, hospice care, and home health care. Part B covers outpatient services: doctor visits, preventive screenings, vaccines, wellness visits, durable medical equipment like wheelchairs and walkers, and home health care.
Part D covers prescription drugs through private insurance plans that follow Medicare’s rules. You typically pay a separate premium for Part D coverage.
Original Medicare does not cover routine eye exams, most dental care, or routine physical exams. It also does not cover long-term nursing home care, which is one of the biggest gaps that catches people off guard.
What Medicaid Covers
Medicaid generally covers a broader range of services, particularly for people who need ongoing support. It covers necessary medications, and critically, it covers nursing home care and personal care services that Medicare does not. For elderly individuals who need long-term care in a facility, Medicaid is often the primary payer. Many states even have higher Medicaid income limits specifically for nursing home residents, so you may qualify for Medicaid nursing home coverage even if you haven’t qualified for other Medicaid benefits in the past.
What You Pay
Medicare has clearly defined costs. In 2025, the standard monthly premium for Part B is $185.00, with an annual deductible of $257. Most people don’t pay a premium for Part A if they or a spouse paid Medicare taxes for at least 10 years. Beyond premiums and deductibles, you’re responsible for copayments and coinsurance, and Original Medicare has no yearly cap on out-of-pocket spending. That means your costs can keep climbing unless you carry supplemental coverage like Medigap or enroll in a Medicare Advantage plan.
Medicaid costs are minimal by comparison. Because the program is designed for people with limited financial resources, out-of-pocket costs are very low or nonexistent depending on your state and income level.
Original Medicare vs. Medicare Advantage
Within Medicare itself, you choose between two paths. Original Medicare (Parts A and B) lets you see any doctor or hospital in the country that accepts Medicare. You have maximum flexibility but no out-of-pocket cap and no extras like dental or vision.
Medicare Advantage plans are offered by private insurers as an alternative. They must cover everything Original Medicare covers, but they often add benefits like dental, vision, and hearing. The tradeoff is that you typically need to use doctors within the plan’s network, and out-of-network care costs more. The upside: Medicare Advantage plans set a yearly limit on your out-of-pocket spending. Once you hit that cap, you pay nothing for covered services the rest of the year.
Having Both at the Same Time
Some people qualify for both programs simultaneously. They’re called “dual eligibles,” and roughly speaking, these are people who meet Medicare’s age or disability criteria and also have low enough income to qualify for Medicaid in their state.
When you have both, Medicare pays first for any Medicare-covered service. Medicaid fills in the gaps. Your state pays your Part B premium and may also cover your share of Medicare deductibles, coinsurance, and copayments. You’re automatically enrolled in a Medicare Part D drug plan, so Medicare handles your prescriptions. If Medicare doesn’t cover a particular drug, Medicaid may still cover it. Medicaid can also pay for services Medicare doesn’t touch, like long-term nursing home stays and personal care.
Dual eligibles also automatically qualify for Extra Help, a federal program that significantly reduces prescription drug costs under Part D.
Enrollment Differences
Medicare has specific enrollment windows. Your Initial Enrollment Period begins around your 65th birthday, and missing it can result in permanent late-enrollment penalties on your premiums. There’s also an Annual Enrollment Period each fall when you can switch between Original Medicare and Medicare Advantage or change your Part D plan. Special Enrollment Periods let you make changes outside these windows if you experience qualifying life events, like moving to a new area, losing employer coverage, or losing Medicaid eligibility.
Medicaid enrollment is open year-round. You apply through your state’s Medicaid office whenever you think you qualify, and coverage can begin as soon as you’re approved. There are no annual enrollment windows or late penalties.
The Key Differences at a Glance
- Eligibility basis: Medicare is based on age (65+) or disability. Medicaid is based on income and resources.
- Administration: Medicare is a single federal program with uniform rules. Medicaid varies state by state.
- Long-term care: Medicare does not cover long-term nursing home stays. Medicaid does.
- Cost to you: Medicare charges premiums, deductibles, and coinsurance. Medicaid has minimal or no out-of-pocket costs.
- Prescription drugs: Medicare covers drugs through Part D plans with separate premiums. Medicaid covers necessary medications at little to no cost.
- Enrollment: Medicare has fixed enrollment periods. Medicaid allows year-round applications.