Medicare Advantage vs Medigap: Which Plan Saves You Money?

Turning 65 and enrolling in Medicare is one of the biggest financial decisions you'll make in retirement. The difference between choosing Medicare Advantage and Medigap could cost you $3,000 to $5,000 per year in out-of-pocket expenses. But which one is actually right for your health, lifestyle, and budget? This comprehensive guide breaks down everything you need to know to make an informed decision.

What Is Medicare Advantage vs Medigap?

Let's start with clarity: both are legitimate ways to get Medicare coverage, but they work completely differently.

Medicare Advantage (Part C) is an alternative to Original Medicare. Insurance companies run these plans on behalf of Medicare. With Advantage, you're getting Parts A, B, and usually D (prescription drug coverage) bundled into one private plan. You'll have copays, coinsurance, and an annual out-of-pocket maximum (capped at $8,050 for 2026). Most plans include extra benefits like dental, vision, or gym memberships. The catch: you must use in-network doctors, and you need approval for specialist visits.

Medigap (Medicare Supplement) works alongside Original Medicare (Parts A and B). It's also sold by private insurers, but it supplements what Medicare covers—not replaces it. Medigap helps pay your deductibles, copayments, and coinsurance. There's no out-of-pocket maximum (theoretically unlimited costs, though most people don't hit them), and you can see any doctor in the US who accepts Medicare.

Think of it this way: Advantage is an all-in-one plan you negotiate with. Medigap is pure supplemental insurance that fills gaps in Original Medicare.

Medicare Advantage: Lower Premiums, More Limits

Medicare Advantage attracts roughly 28.6% of Medicare beneficiaries (about 10.6 million people as of 2026), primarily because of one thing: many Advantage plans have $0 monthly premiums.

Here's the real cost breakdown:

Premiums: Many plans charge $0/month because insurers recoup money through your copays and coinsurance. If a plan does charge a premium, expect $50–$200/month in 2026.

Out-of-Pocket Costs: This is where Advantage gets expensive. In 2026, your maximum out-of-pocket spending is capped at $8,050 per year. That sounds good—and it is, if you're a heavy healthcare user. But let's be real: if you're relatively healthy, you might pay $1,500–$3,000 annually in copays before hitting that cap.

Network Restrictions: This is the biggest trade-off. Most Advantage plans are HMOs (Health Maintenance Organizations), meaning you must use in-network doctors. If you travel out-of-state frequently, this is painful. Preferred Provider Organization (PPO) Advantage plans offer more flexibility but cost more.

Prior Authorization: Need a specialist visit? Many plans require you to call for approval first. This delays care but saves the insurer money.

Extra Benefits: Here's where Advantage shines. Most plans include dental (cleanings, fillings), vision (eye exams, glasses), and hearing aids—benefits Original Medicare doesn't cover. Some plans offer gym memberships (like SilverSneakers), transportation to medical appointments, or meal delivery services. These can add up to $3,000+ in annual value.

Medigap: Predictable Costs, Maximum Freedom

Medigap appeals to about 8.2 million Medicare beneficiaries who prioritize flexibility and predictability over low premiums.

Premiums: Here's the reality: Medigap is more expensive upfront. Monthly premiums range from $100–$350+ per month depending on your age, state, and health status. That's $1,200–$4,200 annually. But you know exactly what you're paying—no surprises.

Out-of-Pocket Costs: This is Medigap's superpower. Once you've paid your plan premium and Original Medicare's deductibles, many Medigap plans cover the rest of your copays and coinsurance. Plans like Plan G and Plan N are the most popular. Plan G covers nearly everything except the Part B deductible ($240 in 2026). You could see a specialist tomorrow without asking permission.

Doctor Choice: You can see ANY doctor in the US who accepts Medicare. No network restrictions, no prior authorization, no delays. This matters if you have a trusted specialist or travel frequently.

Stability: Your Medigap premium might increase annually due to inflation, but your coverage doesn't change unexpectedly. You won't get surprise bills or discover your favorite doctor left your plan's network mid-year.

Medicare Advantage vs Medigap: Side-by-Side Comparison

How Healthcare Costs Really Differ: Real Numbers

Let's walk through two realistic 2026 scenarios:

Scenario 1: Relatively Healthy Retiree (Age 68)

• Routine doctor visits: 2 annual visits
• One specialist referral (cardiologist checkup)
• Occasional urgent care
• No major procedures

Medicare Advantage Option (zero-premium HMO)

• Premium: $0/month = $0/year
• Primary care copay (2 visits × $15): $30
• Specialist copay (1 visit × $50): $50
• Urgent care copay (1 visit × $85): $85
• Total annual cost: $165

Medigap Option (Plan G)

• Premium: $180/month = $2,160/year
• Part B deductible (paid once): $240
• All copays and coinsurance: $0
• Total annual cost: $2,400

Scenario 2: Complex Health Needs (Age 72)

• Diabetes and heart disease (chronic management)
• 8 doctor visits annually
• 3 specialist visits
• One overnight hospital stay
• Multiple medications
• Arthritis treatment (physical therapy)

Medicare Advantage Option (zero-premium HMO)

• Premium: $0/month = $0/year
• Primary care copays (8 × $15): $120
• Specialist copays (3 × $50): $150
• Hospital copay (1 × $350): $350
• Physical therapy (10 sessions × $25): $250
• Reaches out-of-pocket maximum of $8,050 (hypothetically, with more services)
• Total annual cost: ~$3,500–$5,000 (depending on intensity)

Medigap Option (Plan G)

• Premium: $200/month = $2,400/year
• Part B deductible: $240
• All copays, coinsurance, hospital stays: $0
• Total annual cost: $2,640

Notice: for the healthy person, Advantage saves money. For the sick person, Medigap is usually cheaper and offers better access.

Prescription Drug Coverage: Don't Overlook This

Both Advantage and Medigap can include prescription drug coverage (Part D), but how it works differs.

Medicare Advantage: Most plans include drug coverage at no extra charge. You'll have a formulary (list of covered drugs), tiered copays ($5–$100+ depending on drug tier), and coverage gaps. The "donut hole" is smaller than it used to be, but it still exists for expensive medications.

Medigap + Part D Separately: If you choose Medigap, you must separately enroll in a Part D plan from companies like CVS Caremark, Humana, or United Healthcare. You'll pay two premiums: Medigap + Part D. However, you have more flexibility choosing your drug plan independent of your doctor network.

Pro tip: Use Medicare's official plan finder at Medicare.gov to compare actual 2026 drug plans. Input your current medications—costs vary wildly by plan.

When to Choose Medicare Advantage

1. You're generally healthy and don't expect major medical expenses
2. You want dental, vision, or hearing benefits included (Medigap doesn't cover these)
3. You prefer a $0 or low monthly premium
4. You're comfortable with network restrictions and live in one area
5. You want predictable copay costs (you know ER is $350, specialist is $50)
6. You value extra perks: gym memberships, meal delivery, transportation

When to Choose Medigap

1. You have complex health needs: diabetes, cancer history, multiple chronic conditions
2. You travel frequently or split time between states
3. You have a trusted specialist you don't want to lose
4. You want maximum doctor flexibility with no prior authorization
5. You want predictable total costs with no surprise out-of-pocket limits
6. You're willing to pay higher premiums for peace of mind

How to Enroll: Timing Matters

Medicare Advantage or Medigap enrollment happens during specific windows:

• Initial Enrollment Period: 3 months before, during, and 3 months after your 65th birthday
• Annual Enrollment Period: October 15–December 7 each year (coverage starts January 1)
• Special Enrollment Period: If you lose employer coverage or move out-of-state

Critical mistake: Missing these windows can mean waiting until next year OR paying permanent late enrollment penalties (8–10% higher premiums for life if you choose Medigap late).

Practical Steps to Decide

1. List your current doctors and verify they accept your plan choice. Visit Medicare.gov's plan finder and search your doctor's name. A $0-premium Advantage plan is worthless if your cardiologist isn't in-network.

2. Add up your actual healthcare costs from the past 2 years. Be honest: do you visit the doctor monthly or once annually? The answer shapes your math.

3. Calculate both scenarios for your specific situation. Take the premium + likely copays and compare. Use tools like Medicare.gov's plan comparison tool.

4. Consider your health trajectory. If you're 67 and relatively healthy but have a family history of Alzheimer's or heart disease, Medigap might protect your future self.

5. Check what's available in your ZIP code. Not all plans are offered everywhere. Some rural areas have limited Advantage options.

6. Review the plan documents, not the marketing brochure. Marketing materials emphasize free gym memberships; fine print reveals copay structures. Read both.

7. If you're on a tight budget, crunch the numbers month-by-month. A $0-premium Advantage plan beats Medigap's $180/month if your annual costs are under $2,160.

FAQ: Medicare Advantage vs Medigap

Q: Can I switch from Medicare Advantage to Medigap mid-year?

A: No, not easily. You can switch during the Annual Enrollment Period (Oct 15–Dec 7) each year, or during certain Special Enrollment Periods if you move or lose coverage. Switching outside these windows means waiting until next year. If you're under 65 or within 6 months of turning 65, you have guaranteed Medigap approval regardless of health (no underwriting). After that, insurers can deny you or charge more based on pre-existing conditions.

Q: What's the "donut hole" in Medicare drug coverage?

A: The donut hole (coverage gap) happens when your total drug costs exceed $6,350 in 2026. You'll pay more out-of-pocket until costs hit $7,900, at which point catastrophic coverage kicks in. Both Advantage and Part D standalone plans have this gap, though manufacturers' discounts have reduced it. Check your specific plan's formulary to estimate your costs.

Q: Do I lose Medicare Advantage benefits if I move to a different state?

A: Yes. Advantage plans are regional—they don't follow you across state lines. If you move, you'll enter a Special Enrollment Period allowing you to switch plans. If you can't find a comparable Advantage plan in your new state, you can switch to Medigap without medical underwriting (guaranteed issue). This is why Medigap is better for people who split time between homes.

Q: Will my Medigap premium increase every year?

A: Most likely. Medigap premiums increase due to inflation, aging, and claims experience. On average, expect 3–8% annual increases, though it varies by state and insurer. Your coverage itself won't change (Plan G is always Plan G), but your premium will climb. This is more predictable than Advantage, where the plan itself might change yearly (new network, new benefits).

Q: What if I can't afford either option?

A: If you have low income, you may qualify for Medicaid benefits that wrap around Medicare (called "dual eligible"). Medicaid can cover your premiums and out-of-pocket costs. Contact your state's Medicaid office or call 1-800-Medicare for an eligibility check. Some also qualify for Extra Help with Part D costs.

Q: Is Medigap available to everyone, or can I be denied?

A: If you enroll in Medigap within 6 months of turning 65 or losing employer coverage, you have "guaranteed issue" rights—insurers must sell you a plan regardless of health. Outside this window, insurers can deny you or charge more (medical underwriting). This is why timing your initial Medigap enrollment matters. After age 65, switching from Advantage to Medigap is costlier because you lose guaranteed issue protection.

Q: Can I have both Medicare Advantage AND Medigap?

A: No. Medicare rules prohibit this. You choose one path: Original Medicare + Medigap, or Medicare Advantage. However, you can have Advantage + Part D drug coverage, which is allowed.

The Bottom Line

There's no universal "best" answer between Medicare Advantage and Medigap—it depends entirely on your health, budget, and lifestyle. Healthy, locally-rooted seniors usually save money with Advantage's $0 premiums. Complex medical needs and frequent travelers typically save money with Medigap's predictability and freedom. Start by listing your doctors, estimating annual healthcare costs, and running the numbers on 2–3 specific plans in Medicare.gov's plan finder. Set a calendar reminder for October 15th each year to review your choice. Your decision at 65 can save or cost you thousands in retirement.