Medicaid vs Medicare: What's the Difference? A Complete Guide
Medicaid and Medicare are both government health insurance programs, but they serve different populations and work very differently. Despite their similar names, confusing the two can lead to missed enrollment deadlines, unexpected costs, and gaps in coverage. This guide explains exactly how each program works, who qualifies, what's covered, and what you'll pay out of pocket.
⚡ Quick Answer
Medicare is a federal program primarily for people age 65 and older (or with certain disabilities), regardless of income. Medicaid is a joint federal-state program for low-income individuals and families of any age. Some people qualify for both ("dual eligible").
📑 In This Guide
1. Side-by-Side Comparison
| Feature | Medicare | Medicaid |
|---|---|---|
| Run By | Federal government (CMS) | States (with federal funding/guidelines) |
| Who Qualifies | Age 65+, or under 65 with qualifying disability/ESRD | Low-income individuals and families (varies by state) |
| Based On | Age and/or disability status | Income and household size |
| Premium | Part A: usually $0; Part B: ~$185/month (2025) | Usually $0 or very minimal |
| Deductible | Part A: $1,676/stay; Part B: $257/year (2025) | Usually $0 or very low |
| Prescription Drugs | Requires Part D plan (additional premium) | Included in most state programs |
| Long-Term Care | Very limited (skilled nursing only, max 100 days) | Covers nursing home and home care for eligible individuals |
| Dental/Vision | Not covered under Original Medicare | Often included (varies by state) |
| Enrollment | Initial period around 65th birthday; Annual Oct 15 – Dec 7 | Year-round (no enrollment periods) |
| Coverage Uniform? | Yes — same nationwide | No — varies significantly by state |
2. What Is Medicare?
Medicare is a federal health insurance program that has been providing coverage since 1965. It primarily serves Americans aged 65 and older, but also covers younger people with certain qualifying disabilities or End-Stage Renal Disease (ESRD). Unlike Medicaid, Medicare eligibility is not based on income—a millionaire and someone living on Social Security both qualify at age 65.
Medicare is administered by the Centers for Medicare & Medicaid Services (CMS), and its rules are the same across all 50 states. Approximately 67 million Americans are enrolled in Medicare as of 2025. Most people become eligible through their own (or a spouse's) work history of at least 10 years paying Medicare taxes.
3. The Four Parts of Medicare Explained
Medicare is divided into four distinct parts, each covering different services. Understanding these parts is essential because gaps between them can leave you with significant out-of-pocket expenses.
Part A — Hospital Insurance
Covers inpatient hospital stays, skilled nursing facility care (up to 100 days after a qualifying hospital stay), hospice care, and some home health services.
Cost: Most people pay $0 in premiums for Part A if they (or their spouse) paid Medicare taxes for 40+ quarters. The 2025 Part A deductible is $1,676 per benefit period.
Part B — Medical Insurance
Covers doctor visits, outpatient care, preventive services, durable medical equipment, and some home health services. Does NOT cover routine dental, vision, or hearing.
Cost: Standard 2025 premium is $185/month (higher for high earners). Annual deductible is $257. After the deductible, you typically pay 20% coinsurance with no annual cap.
Part C — Medicare Advantage
Private insurance plans (approved by Medicare) that combine Part A, Part B, and usually Part D coverage into one plan. Often includes extra benefits like dental, vision, hearing, and gym memberships.
Cost: Many plans have $0 additional premiums (you still pay Part B). Plans have annual out-of-pocket maximums, unlike Original Medicare, providing financial protection.
Part D — Prescription Drug Coverage
Covers outpatient prescription medications. Available as standalone plans or bundled with Medicare Advantage. Each plan has a formulary (list of covered drugs) and different cost-sharing tiers.
Cost: Average 2025 premium is ~$35/month. Starting in 2025, the out-of-pocket cap for Part D is $2,000/year—a historic change that protects seniors from catastrophic drug costs.
⚠️ Important: Original Medicare (Parts A + B) has no annual out-of-pocket maximum. This means a serious illness could cost tens of thousands of dollars. That's why many Medicare beneficiaries also purchase a Medigap (Medicare Supplement) policy or choose Medicare Advantage (Part C) for financial protection.
4. Medicare Costs: What You'll Pay
Despite being government-provided, Medicare is not free. Here's a realistic breakdown of what Medicare beneficiaries typically pay out of pocket in 2025:
| Cost Category | Typical Annual Cost |
|---|---|
| Part B Premium | $2,220/year ($185/month) |
| Part D Premium (average) | $420/year (~$35/month) |
| Medigap or MA Premium | $0 – $3,000+/year (varies) |
| Deductibles & Cost-Sharing | $1,000 – $5,000+ (depends on health needs) |
| Typical Total (healthy beneficiary) | $3,000 – $5,000/year |
| Total with Chronic Conditions | $7,000 – $12,000+/year |
5. What Is Medicaid?
Medicaid is a joint federal-state program that provides health coverage to low-income individuals and families. Unlike Medicare, which is the same everywhere, Medicaid varies significantly from state to state. Each state sets its own eligibility rules, covered services, provider payment rates, and program administration—within federal guidelines.
Medicaid is the largest source of health coverage in the United States, covering approximately 90 million people including children, pregnant women, elderly adults, and people with disabilities. For many enrollees, Medicaid provides comprehensive coverage with little to no out-of-pocket costs.
The Affordable Care Act gave states the option to expand Medicaid to cover all adults with incomes up to 138% of the Federal Poverty Level (approximately $20,783 for an individual in 2025). As of 2025, 40 states plus Washington D.C. have adopted Medicaid expansion, while 10 states have not, creating a significant "coverage gap" in non-expansion states.
6. Medicaid Eligibility by State
Because Medicaid is administered by each state, eligibility rules differ. However, there are common categories that most states cover:
Children & Pregnant Women
All states cover children in families with incomes up to at least 138% FPL, and many cover up to 200-300% FPL through CHIP. Pregnant women are covered at higher income thresholds in most states. These are the most uniformly generous Medicaid categories.
Adults in Expansion States
In the 40 states that expanded Medicaid, all adults with incomes up to 138% FPL ($20,783 for an individual, $42,900 for a family of 4) qualify. This includes childless adults who previously had no path to Medicaid.
Adults in Non-Expansion States
In states that haven't expanded Medicaid, adults without dependent children generally don't qualify regardless of income. Parents may qualify only at very low income levels (often below 50% FPL). This creates a "coverage gap" where people earn too much for Medicaid but too little for ACA marketplace subsidies.
Elderly & Disabled
All states provide Medicaid to people receiving Supplemental Security Income (SSI) and other qualifying disabled individuals. Elderly adults who need nursing home care may qualify based on both income and asset limits. Medicaid is the primary payer for nursing home care in the United States.
7. What Medicaid Covers
Federal law requires all state Medicaid programs to cover certain "mandatory" services. States can also choose to cover additional "optional" services. In practice, most state Medicaid programs are more comprehensive than many private insurance plans:
Mandatory Services (Required in All States)
- Inpatient and outpatient hospital services
- Physician services and nurse practitioner visits
- Laboratory and X-ray services
- Nursing facility services (for adults 21+)
- Home health services for those eligible for nursing care
- Family planning services and supplies
- Early and periodic screening for children under 21 (EPSDT)
- Federally qualified health center (FQHC) services
- Transportation to medical appointments
Common Optional Services (Covered by Most States)
- Prescription drugs (covered by all states in practice)
- Dental services (varies significantly—some states offer comprehensive dental, others only emergency)
- Vision services and eyeglasses
- Physical and occupational therapy
- Mental health and substance abuse treatment
- Personal care services and home/community-based waiver services
- Hospice care
8. Dual Eligible: Qualifying for Both Medicare and Medicaid
Approximately 12 million Americans qualify for both Medicare and Medicaid simultaneously—these individuals are called "dual eligibles." This typically includes low-income seniors (age 65+) and younger people with disabilities who have limited income and resources.
Being dual eligible provides significant financial protection. For these beneficiaries:
- Medicare is the primary payer for most medical services (hospital stays, doctor visits, etc.)
- Medicaid covers the gaps—paying Medicare premiums, deductibles, copays, and covering services Medicare doesn't (like long-term care, dental, and vision)
- Out-of-pocket costs are minimal—often $0 for most services
- Prescription drugs are covered through Medicare Part D with extra financial help (Low Income Subsidy/Extra Help)
💰 Medicare Savings Programs
Even if you don't fully qualify for Medicaid, you may qualify for a Medicare Savings Program (MSP) that helps pay Medicare costs. Programs include QMB (pays Part B premium + deductibles/coinsurance), SLMB (pays Part B premium), and QI (pays Part B premium). Income limits are higher than full Medicaid eligibility—up to 135% FPL for QI. Contact your state Medicaid office or call 1-800-MEDICARE to check eligibility.
9. How to Apply
Applying for Medicare
Most people are automatically enrolled in Medicare Parts A and B when they turn 65 if they're already receiving Social Security benefits. Otherwise, you must actively enroll during your Initial Enrollment Period (IEP)—a 7-month window that starts 3 months before your 65th birthday month and ends 3 months after.
- Online: Apply at SSA.gov
- Phone: Call Social Security at 1-800-772-1213
- In Person: Visit your local Social Security office
⚠️ Late Enrollment Penalty: If you don't sign up for Part B during your IEP and don't have qualifying employer coverage, you'll face a lifetime penalty of 10% added to your Part B premium for each full 12-month period you could have had coverage but didn't. This penalty never goes away.
Applying for Medicaid
Unlike Medicare, you can apply for Medicaid at any time—there are no enrollment periods. If you qualify, coverage can even be retroactive up to 3 months before your application date.
- Online: Apply through HealthCare.gov (which will route you to your state Medicaid agency) or your state's Medicaid website directly
- Phone: Contact your state Medicaid office (find numbers at Medicaid.gov)
- In Person: Visit your local Department of Social Services or community health center
- Through a Hospital: If you're hospitalized, the hospital's financial counselor can often help you apply on the spot
10. Common Mistakes to Avoid
❌ Assuming Medicare Covers Everything
Original Medicare has significant gaps: no dental, vision, or hearing coverage; no prescription drugs without Part D; no long-term care coverage; and no annual out-of-pocket cap. Plan for supplemental coverage to avoid catastrophic costs.
❌ Missing Medicare Enrollment Deadlines
Medicare has strict enrollment windows. Missing your Initial Enrollment Period can result in lifetime premium penalties and coverage gaps. If you're turning 65, start researching your options 3-6 months in advance.
❌ Not Checking Medicaid Eligibility
Many people who qualify for Medicaid never apply because they assume they earn too much. In expansion states, an individual earning up to $20,783 qualifies. Even in non-expansion states, children, pregnant women, and disabled individuals have higher income limits.
❌ Not Applying for Dual Eligibility Programs
If you're on Medicare with limited income, you may qualify for Medicaid, Medicare Savings Programs, or the Extra Help/Low Income Subsidy program for Part D drugs. These programs can save you thousands per year.
❌ Confusing the Two Programs When Seeking Care
Medicare and Medicaid have different provider networks. Not all doctors accept Medicaid (due to lower payment rates), and not all Medicare providers participate in Medicaid programs. Always verify your coverage with a provider before receiving care.
Frequently Asked Questions
Can I have both Medicare and private insurance?
Yes. Many employers offer retiree health benefits that work alongside Medicare. You can also purchase a Medigap (Medicare Supplement) policy to cover the gaps in Original Medicare. However, you cannot have a Medigap policy if you choose Medicare Advantage (Part C).
Do I need Medicare if I'm still working at 65?
If you have employer coverage through a company with 20+ employees, you can delay Medicare enrollment without penalty. You'll get a Special Enrollment Period when your employer coverage ends. However, if the employer has fewer than 20 employees, Medicare becomes primary and you should enroll at 65.
What happens to my Medicaid when I turn 65?
You don't necessarily lose Medicaid at 65. If you still meet income and resource requirements, you can become dual eligible for both Medicare and Medicaid. Medicare becomes the primary insurer, and Medicaid fills in the gaps. You should enroll in Medicare at 65 even if you have Medicaid.
Can immigrants qualify for Medicare or Medicaid?
Legal permanent residents who have lived in the US for 5+ continuous years can qualify for Medicare at 65 (they may need to pay a premium for Part A if they haven't worked 40 quarters). Medicaid eligibility for immigrants varies by state—some states cover all income-eligible residents regardless of immigration status.
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Sources & References
- Centers for Medicare & Medicaid Services — Medicare.gov
- Medicaid.gov — Medicaid Eligibility
- Kaiser Family Foundation — Medicare Policy Research
- Social Security Administration — Medicare Enrollment
- MACPAC — Medicaid and CHIP Payment and Access Commission
Disclaimer: This article is for educational purposes only and does not constitute insurance, legal, or financial advice. Medicaid eligibility rules vary by state and change frequently. Medicare costs and coverage details are based on 2025 figures and may change annually. Always consult Medicare.gov, your state Medicaid office, or a licensed insurance professional for information specific to your situation.