Medicare vs Medicaid: Complete Guide to the Difference, Eligibility & Coverage

The distinction between the Medicare and Medicaid baffles millions of Americans annually and the names are not helping. Both are federal health programs. Both start with "Medi." They both came into effect on the same day in 1965. Yet they work with entirely different individuals, do not work the same way, and have other rules. Medicare is health insurance based on age i.e. mostly to the individuals who are 65 years and above. Income-based health coverage of individuals with low income, irrespective of their age, is the definition of Medicaid. There are those individuals who are eligible to both.

This guide takes you through what each program does, who is eligible, what it costs, what it covers and how the dual eligibility works. The source of the information is CMS, Medicare.gov, Medicaid.gov, and KFF. 

What is Medicare and what is Medicaid?

Medicare is a federal health insurance program among individuals aged 65 and above, and those aged under 65 with specific disabilities or end-stage renal disease. It is a payroll tax funded mainly by the payroll taxes that you have been paying since the majority of your working life. There are no income, or other, requirements needed to access eligibility, and the benefits are typically the same in all states.

Medicaid is a federal-state initiative, which offers health care coverage to low-income earners. Every state operates a variant of it, and the federal government funds it the same as the states. The rules, eligibility and services covered differ greatly depending on the state. According to CMS statistics, approximately 80 million people are covered by the largest health insurance program in the U.S., which is Medicaid.

The abbreviation most insurance brokers use: Medicare is for old, Medicaid is for low income. 

Medicare vs Medicaid: side-by-side comparison

The medicare and medicaid difference shows up clearest in a side-by-side view. Both programs cover doctor visits, hospital stays, and prescriptions, but the eligibility and cost structure are very different.

Medicare has four parts (A, B, C, D), each covering different services. Medicaid has one main program in each state, with optional add-ons. The plan structures are different enough that "Medicare vs Medicaid" isn't really the right framing for most people. The real question is which one you're eligible for, and whether you might qualify for both.

What's the difference between Medicare and Medicaid eligibility?

How do Medicare and Medicaid differ in the number of people eligible? It all boils down to age and income. 

Medicare Eligibility requires either age (65 and above) or disability. The Medicare.gov says that the majority of the people are automatically eligible provided they or their spouses worked at least 10 years (40 quarters) paying Medicare taxes. People under 65 qualify if they've received Social Security Disability Insurance (SSDI) for 24 months, or have ALS or end-stage renal disease. 

Medicaid eligibility varies according to income, household size and your states regulations. There are minimum standards of the federal government, but the states establish their own income limits. In states that have expanded Medicaid under the ACA, adults are eligible with up to 138 percent of the Federal Poverty Level (approximately 20,800 in the year 2026). In states not expanded, the income limits are significantly lower or only certain groups are eligible (pregnant people, parents, children, people with disabilities). 

You use the Social Security Administration to apply to Medicare. You enroll in Medicaid on your state Medicaid agency or healthcare.gov. To get state-specific advice, an example of how state rules operate is our Medicaid Illinois guide.

What does each program cover?

Both programs cover most major medical services, but the details differ.

Medicare coverage:

• Part A (hospital): Inpatient hospital stays, skilled nursing facility care, hospice

• Part B (medical): Doctor visits, outpatient care, preventive services, durable medical equipment. See our full Medicare Part B guide for details.

• Part C (Medicare Advantage): Combined Part A + B (and often D) through private insurers

• Part D (prescriptions): Outpatient prescription drugs. See our Medicare Part D explainer

Medicare does not cover most dental, vision, hearing, or long-term care. This is the most common surprise for new beneficiaries. For more on dental gaps, see our does Medicare cover dental guide.

Medicaid coverage: Federal law requires every state Medicaid program to cover hospital and physician services, lab and X-ray, family planning, nursing facility care, home health for people who qualify for nursing home, transportation to medical appointments, and EPSDT (preventive care) for children under 21. States may add prescriptions, dental, vision, physical therapy, and other services as optional benefits. See our Medicaid dental for adults state-by-state guide for one example of how this varies.

Medicaid is significantly more generous than Medicare on long-term care. Most nursing home stays in the U.S. are paid for by Medicaid, not Medicare.

Can you have both Medicare and Medicaid?

Yes. People who qualify for both are called "dual eligible," and roughly 12.5 million Americans fall into this category, according to KFF research. Most are people 65+ with low income.

Dual eligible Medicare Medicaid coverage works like this: Medicare is the primary payer for medical services it covers, and Medicaid kicks in to pay Medicare premiums, copays, and deductibles, plus services Medicare doesn't cover (long-term care, often dental and vision).

The combined coverage is one of the most comprehensive health insurance arrangements available in the U.S. People who qualify often pay $0 out of pocket for nearly all medical care, including prescriptions through the Medicare Savings Program and Extra Help.

To check if you might qualify for both, contact your State Health Insurance Assistance Program (SHIP) or apply through your state Medicaid office.