OpenFinancial

Medicare and Medicaid are both government health insurance programs, both start with "Medic," and both have been around since 1965. Beyond that, they are fundamentally different — in who they serve, how they're run, what they cover, and what they cost. Confusing the two is one of the most common mistakes Americans make when navigating the healthcare system, and that confusion can lead to missed coverage, unexpected bills, or delays in getting the care you need.

This guide breaks down what each program does, who qualifies, what's covered, and what to do if you might be eligible for both.

Medicare: Federal Health Insurance Based on Age or Disability

Medicare is a federal program — meaning the rules and coverage are the same regardless of which state you live in. It primarily serves people aged 65 and older, though younger individuals may qualify if they have received Social Security Disability Insurance (SSDI) benefits for at least 24 months, have been diagnosed with end-stage renal disease requiring dialysis or a transplant, or have ALS (Lou Gehrig's disease).

Approximately 69 million Americans were enrolled in Medicare as of late 2024. The program is funded through a combination of payroll taxes, premiums paid by enrollees, and general federal revenue.

Medicare has four main parts. Part A covers inpatient hospital stays, limited skilled nursing facility care, hospice services, and some home health care. Most people don't pay a premium for Part A if they or their spouse paid Medicare taxes while working. Part B covers outpatient care — doctors' visits, preventive services, lab work, medical equipment, and mental health services. The standard Part B premium in 2025 is $185 per month, with a $257 annual deductible. Part C, also known as Medicare Advantage, is offered by private insurers and bundles Parts A and B (and usually Part D) into a single plan, often with additional benefits like dental, vision, and hearing coverage. Part D provides prescription drug coverage through private plans and comes with its own premiums, deductibles, and copays.

Medicare does not cover everything. Long-term nursing home care, most dental work, routine vision and hearing exams, and overseas medical care are generally not included under Original Medicare (Parts A and B). This is a critical gap that catches many people off guard.

Medicaid: State-Run Insurance Based on Income

Medicaid is a joint federal and state program designed to provide health coverage to people with limited income and resources — regardless of age. The federal government sets baseline rules, but each state administers its own version of the program, which means eligibility requirements, covered services, and even the program's name can vary significantly from one state to the next.

To qualify for Medicaid, your income generally needs to fall below a certain percentage of the federal poverty level (FPL). Forty states plus Washington, D.C. have expanded Medicaid under the Affordable Care Act to cover adults with incomes at or below 133 percent of the FPL. In non-expansion states, eligibility is more restrictive and often limited to specific groups like pregnant women, children, people with disabilities, and very low-income parents.

Medicaid covers a broad range of services — often broader than Medicare. Federal law requires coverage of inpatient and outpatient hospital care, doctor visits, lab and x-ray services, home health services, and nursing facility services. Many states go further, adding dental care, vision, physical therapy, prescription drugs, and personal care services. Long-term care — including in-home assistance and nursing home stays — is one of Medicaid's most significant benefits and one that Medicare largely does not provide.

Out-of-pocket costs under Medicaid are intentionally minimal. Many enrollees pay nothing at all for covered services. When cost-sharing does apply, it's capped at five percent of household income, and certain groups — including children and pregnant individuals — are exempt from nearly all out-of-pocket expenses.

One important change to be aware of: starting January 1, 2027 (or earlier in some states), certain adults will need to complete at least 80 hours per month of work or other approved activities to maintain Medicaid eligibility. This requirement does not apply to people who also have Medicare.

Key Differences at a Glance

Eligibility basis: Medicare is primarily based on age (65+) or disability status. Medicaid is based on income level.

Administration: Medicare is fully federal — same rules nationwide. Medicaid is administered by each state individually, so coverage and eligibility vary by location.

Cost to enrollees: Medicare involves premiums, deductibles, copays, and coinsurance that can add up. Medicaid has little to no cost-sharing.

Coverage scope: Medicaid typically covers more than Medicare, including long-term care, personal care services, and transportation to medical appointments. Medicare provides more standardized acute care coverage.

Enrollment timing: Medicare has specific enrollment windows — you can't sign up whenever you want without potential penalties. Medicaid allows enrollment year-round.

Dual Eligibility: When You Qualify for Both

If you're 65 or older and have a low income, you may qualify for both Medicare and Medicaid simultaneously. People in this situation are called "dual eligibles," and they benefit from having both programs work together. Medicare serves as the primary payer for most medical services, while Medicaid can pick up the costs that Medicare doesn't cover — including premiums, deductibles, copays, and services like long-term care and dental work.

If you're dually eligible, you may also qualify for a Dual Special Needs Plan (D-SNP), which is a type of Medicare Advantage plan specifically designed to coordinate your Medicare and Medicaid benefits in a single package. These plans can simplify your healthcare experience significantly and often include extra benefits.

Additionally, dual-eligible individuals may qualify for a Medicare Savings Program (MSP) like the Qualified Medicare Beneficiary (QMB) program, which covers Part A and Part B premiums, coinsurance, and deductibles.

How to Find Out If You're Eligible

For Medicare, eligibility is straightforward if you're approaching 65. You'll be automatically enrolled if you're already receiving Social Security benefits. If not, you can sign up through the Social Security Administration's website or by calling 1-800-772-1213. Your Initial Enrollment Period begins three months before your 65th birthday and extends three months after.

For Medicaid, visit your state's Medicaid agency website or apply through HealthCare.gov. You can also call 1-877-267-2323 for assistance. There is no enrollment window — you can apply at any time.

If you think you might qualify for both, a State Health Insurance Assistance Program (SHIP) counselor can help you navigate the process for free. Find your local SHIP at shiphelp.org or call 1-877-839-2675.

Sources

U.S. Department of Health and Human Services. "What's the Difference Between Medicare and Medicaid?" hhs.gov
Harvard Health Publishing. "Medicare versus Medicaid: Key Differences." December 2024. health.harvard.edu
National Council on Aging. "Medicare vs. Medicaid: What's the Difference?" ncoa.org