Medicare vs. Medicaid: Key Differences and Coverage Explained

Table of Contents#

1. What Is Medicare?
2. What Is Medicaid?
3. Core Differences Between Medicare and Medicaid
4. Can You Have Both Medicare and Medicaid?
5. Key Changes Under the 2025 Reconciliation Law (H.R. 1)
6. Frequently Asked Questions
7. Final Takeaways
8. References

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What Is Medicare?#

Medicare is a federally run health insurance program designed primarily for older adults, with exceptions for people with qualifying disabilities. It operates with consistent rules and benefits across all 50 U.S. states, and eligibility is not tied to income level for most enrollees.

Eligibility Requirements#

You qualify for Medicare if you meet one of the following criteria:

• You are 65 years of age or older, and are a U.S. citizen or legal permanent resident who has lived in the U.S. for at least 5 consecutive years
• You are under 65 and have received Social Security Disability Insurance (SSDI) for 24 consecutive months
• You have end-stage renal disease (ESRD) or amyotrophic lateral sclerosis (ALS, Lou Gehrig’s disease)

Coverage Structure#

Medicare is split into four distinct parts, each covering different types of care:

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What Is Medicaid?#

Medicaid is a joint federal-state health insurance program designed to provide low-cost or free care to low-income individuals and families of all ages. While the federal government sets baseline rules, each state manages its own Medicaid program, so eligibility thresholds and covered benefits vary widely across state lines.

Eligibility Requirements#

Eligibility is primarily based on income and household size, plus categorical eligibility for most states. Common eligible groups include:

• Low-income adults (under 65) with income up to 138% of the federal poverty level (FPL) in states that expanded Medicaid under the Affordable Care Act (ACA)
• Pregnant people
• Children and teens under 19 (through Medicaid and the Children’s Health Insurance Program, CHIP)
• Low-income adults 65 and older
• People with disabilities

As of 2026, 41 states and Washington D.C. have expanded Medicaid eligibility to all low-income adults under 65, regardless of categorical status. Ten states have not adopted the expansion.

Coverage Structure#

Federal rules require all state Medicaid programs to cover a core set of mandatory benefits, while states can choose to add optional benefits:

• Mandatory benefits: Inpatient and outpatient care, lab and x-ray services, prenatal and maternity care, pediatric care, nursing facility care for adults, and family planning services
• Common optional benefits: Adult dental and vision care, prescription drug coverage, physical and occupational therapy, mental health and substance use disorder treatment, and long-term nursing home care (the single largest Medicaid spending category nationwide)

Most Medicaid enrollees pay $0 in monthly premiums, and copays for routine services are capped at less than$10 per visit per federal rules.

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Core Differences Between Medicare and Medicaid#

The table below summarizes the most important distinctions between the two programs:

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Can You Have Both Medicare and Medicaid?#

Yes, it is possible to qualify for both programs at the same time, a status called dual eligibility. Approximately 12 million Americans were dually eligible as of 2025.

Dual eligibility applies if you meet Medicare’s age or disability eligibility requirements, and your income and assets fall below your state’s Medicaid eligibility thresholds. Medicaid acts as a secondary payer in these cases, covering costs that Medicare does not, including:

• Medicare Part A and Part B premiums
• Medicare deductibles, copays, and coinsurance
• Services not covered by Medicare, such as long-term nursing home care, adult dental, and vision services

There are two types of dual eligibility:

1. Full dual eligible: Qualify for all Medicaid benefits, including full coverage for non-Medicare services
2. Partial dual eligible: Only qualify for Medicaid help covering Medicare cost-sharing, not full Medicaid benefits

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Key Changes Under the 2025 Reconciliation Law (H.R. 1)#

Signed into law on July 4, 2025, the federal reconciliation bill introduced significant changes to both Medicare and Medicaid that take effect between 2026 and 2028:

Medicare Changes#

• Immigration-based eligibility restrictions: Only U.S. citizens, lawful permanent residents (green card holders), Cuban/Haitian entrants, and Compact of Free Association (COFA) migrants can file new Medicare applications. Refugees, asylees, and trafficking survivors who are not already enrolled are no longer eligible to apply.
• Individuals already enrolled in Medicare as of July 4, 2025, can remain enrolled until January 2027, assuming they meet all other eligibility criteria.

Medicaid Changes#

• Work requirements (effective January 1, 2027): Most enrollees aged 19–64 must document 20 hours per week of work or community service. Exemptions apply for caregivers of children 13 and under, caregivers of individuals with disabilities, pregnant individuals, and people with disabilities.
• More frequent recertification: Starting January 1, 2027, some Medicaid applicants and enrollees must recertify eligibility every six months instead of annually.
• Shorter retroactive coverage: Retroactive coverage is reduced from 90 days to 30 or 60 days, depending on the state.
• Immigration-based eligibility restrictions (effective October 1, 2026): Only U.S. citizens, lawful permanent residents, Cuban/Haitian entrants, and COFA migrants will qualify for Medicaid. Refugees, asylees, and trafficking survivors will lose eligibility.
• Potential copays (effective October 1, 2028): Some low-income Medicaid enrollees may be required to pay up to $35 per service.

Check with your state Medicaid agency or visit Healthcare.gov for the latest information on how these changes may affect you.

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Frequently Asked Questions#

1. Do I have to be low-income to qualify for Medicare?#

No. Medicare eligibility is based on age or disability status, not income. Even high-income adults 65 and older qualify for Medicare, though they may pay higher Part B and Part D premiums.

2. Does Medicare cover long-term nursing home care?#

No. Original Medicare only covers up to 100 days of short-term skilled nursing care after a hospital stay. Medicaid is the primary government program that covers long-term custodial nursing home care for low-income individuals.

3. How do I check if I qualify for Medicaid?#

Eligibility rules vary by state. You can check your eligibility and apply through your state’s Medicaid agency, or through Healthcare.gov.

4. Can I enroll in Medicare and a private insurance plan at the same time?#

Yes. Many enrollees choose Medicare Advantage (Part C) private plans, or add Medigap supplemental plans to Original Medicare to cover out-of-pocket costs.

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Final Takeaways#

• Medicare is a federal health insurance program for adults 65 and older, or people with qualifying disabilities, with consistent rules nationwide and no income limit for standard enrollment.
• Medicaid is a joint federal-state program for low-income people of all ages, with eligibility and benefits that vary by state, and very low out-of-pocket costs for enrollees.
• You can qualify for both programs at the same time if you meet both eligibility criteria, and Medicaid will cover gaps in Medicare coverage.
• The 2025 reconciliation law introduced new restrictions on both programs, including immigration-based eligibility limits and Medicaid work requirements taking effect in 2027. Stay informed about how these changes may affect your coverage.
• If you are unsure about your eligibility, visit official CMS or state Medicaid websites to avoid misinformation and missed benefits.

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References#

1. Centers for Medicare & Medicaid Services (CMS). (2025). 2026 Medicare Costs. Retrieved from https://www.medicare.gov/publications/11579-medicare-costs.pdf
2. Centers for Medicare & Medicaid Services (CMS). (2026). What Original Medicare Covers. Retrieved from https://www.medicare.gov/providers-services/original-medicare
3. Centers for Medicare & Medicaid Services (CMS). (2026). Medicaid Overview. Retrieved from https://www.medicaid.gov/medicaid
4. Kaiser Family Foundation (KFF). (2026). Status of State Medicaid Expansion Decisions. Retrieved from https://www.kff.org/medicaid/status-of-state-medicaid-expansion-decisions/
5. Healthcare.gov. (2026). Medicaid & CHIP Coverage. Retrieved from https://www.healthcare.gov/medicaid-chip/
6. Kaiser Family Foundation (KFF). (2025). Number of Dual-Eligible Individuals. Retrieved from https://www.kff.org/state-health-policy-data/state-indicator/number-of-dual-eligible-individuals/
7. Kaiser Family Foundation (KFF). (2026). Tracking Implementation of the 2025 Reconciliation Law: Medicaid Work Requirements. Retrieved from https://www.kff.org/medicaid/medicaid-work-requirements-tracker-overview/
8. Legal Aid DC. (2025). Upcoming Changes to Medicaid and Medicare. Retrieved from https://www.legalaiddc.org/legal-info/medicare-medicaid-big-beautiful-bill