What Is Medicare Advantage?
Medicare Advantage (Part C) is an all-in-one alternative to Original Medicare offered by private insurance companies approved by Medicare. When you enroll in a Medicare Advantage plan, you receive your Part A (hospital) and Part B (medical) benefits through a single private plan rather than directly from the federal government.
Most Medicare Advantage plans also bundle Part D prescription drug coverage, and many include extras like dental, vision, hearing, and fitness benefits. The trade-off? You typically must use a network of doctors and hospitals (HMO or PPO), and some services may require prior authorization from your insurer.
As of early 2026, over 35 million Americans are enrolled in Medicare Advantage, representing roughly 51% of all eligible Medicare beneficiaries. The average beneficiary can choose from about 42 different plans in their area.
What Is Medigap (Medicare Supplement Insurance)?
Medigap, formally known as Medicare Supplement Insurance, works alongside Original Medicare rather than replacing it. You keep your Original Medicare Parts A and B, and your Medigap policy helps pay the “gaps” that Original Medicare leaves behind, including copayments, coinsurance, and deductibles.
Medigap plans are standardized by letter (Plan A, B, C, D, F, G, K, L, M, and N) in most states. A Plan G from one insurance company offers the same core benefits as a Plan G from another, though premiums may differ. Plan G is currently the most popular choice, covering nearly all out-of-pocket costs except the annual Part B deductible ($257 in 2026).
Importantly, Medigap does not include prescription drug coverage. If you choose the Medigap path, you’ll need a separate standalone Part D plan for your medications.
Medicare Advantage vs. Medigap: Key Differences at a Glance
The core difference comes down to structure: Medicare Advantage replaces Original Medicare with a bundled private plan, while Medigap supplements Original Medicare to fill coverage gaps. You cannot have both at the same time.
| Feature | Medicare Advantage (Part C) | Medigap (Medicare Supplement) |
|---|---|---|
| How It Works | Replaces Original Medicare with an all-in-one private plan | Works alongside Original Medicare to cover out-of-pocket costs |
| Monthly Premium | Often $0 beyond your Part B premium; average ~$17/month | Varies by plan, state, and age; Plan G averages ~$164/month |
| Doctor Choice | Must use plan’s network (HMO/PPO); may need referrals | See any doctor or hospital nationwide that accepts Medicare |
| Out-of-Pocket Maximum | Yes, annual cap (around $8,850–$9,250 for in-network in 2026) | Minimal out-of-pocket costs; most plans cover nearly everything |
| Prescription Drug Coverage | Usually included (bundled Part D) | Not included; must buy a separate Part D plan |
| Dental, Vision, Hearing | Often included | Not included; must purchase separately |
| Prior Authorization | Often required for certain services | Not required; Original Medicare rules apply |
| Travel Coverage | Usually limited to plan’s service area (except emergencies) | Nationwide coverage; some plans cover foreign travel emergencies |
| Plan Stability | Benefits can change annually; plans can leave your area | Standardized benefits are guaranteed renewable and don’t change |
Cost Comparison: What You’ll Actually Pay
Premium alone doesn’t tell the full story. Here’s a realistic breakdown of what each path may cost in 2026:
| Cost Category | Medicare Advantage | Medigap + Part D |
|---|---|---|
| Part B Premium | ~$185/month (required either way) | ~$185/month (required either way) |
| Plan Premium | $0–$17/month average | $130–$250+/month (varies by plan, age, state) |
| Part D Premium | Usually included | ~$40–$50/month (separate plan) |
| Total Monthly Premium | ~$185–$202 | ~$355–$485+ |
| Copays per Doctor Visit | $20–$50 per visit | $0 with most plans (Plan G: only Part B deductible) |
| Worst-Case Annual Out-of-Pocket | Up to ~$8,850–$9,250 (MOOP cap) | $257 Part B deductible + minimal costs |
The bottom line: Medicare Advantage has lower monthly premiums but higher costs when you use services. Medigap has higher premiums but near-zero costs at the point of care. If you’re healthy and rarely see doctors, Medicare Advantage may save you money. If you have chronic conditions or use healthcare frequently, Medigap’s predictable costs can actually be less expensive in the long run.
Pros and Cons of Medicare Advantage
Pros
- Low or $0 monthly premiums beyond your Part B premium
- Bundled benefits: Drug coverage, dental, vision, hearing, and fitness often included
- Out-of-pocket maximum: A built-in annual spending cap protects against catastrophic costs
- Convenience: One card, one plan, one premium for most of your healthcare needs
- Part B premium giveback: Some plans reduce your Part B premium amount
Cons
- Network restrictions: You must use in-network doctors and hospitals for covered care
- Prior authorization: Some treatments, tests, and specialist visits require insurer approval, which can delay care
- Higher costs when sick: Copays accumulate with frequent doctor visits, potentially reaching thousands per year
- Geographic limitations: Coverage is typically limited to a local service area
- Annual plan changes: Benefits, networks, and formularies can change each year
Pros and Cons of Medigap
Pros
- Predictable costs: After your premium, you pay little to nothing for covered services
- Complete provider freedom: See any doctor or hospital in the U.S. that accepts Medicare, with no referrals needed
- Guaranteed renewable: Your insurer cannot drop you as long as you pay your premium
- Standardized plans: Benefits don’t change year to year; a Plan G is a Plan G everywhere
- Travel-friendly: Nationwide coverage, and several plans include foreign travel emergency benefits
Cons
- Higher monthly premiums: Expect $130–$250+ per month depending on your plan, age, and location
- No drug coverage: You must purchase a separate Part D plan
- No extras: Dental, vision, and hearing coverage must be purchased separately
- Medical underwriting: Outside your initial 6-month Medigap Open Enrollment Period, insurers in most states can deny you or charge more based on health history
Who Should Choose Medicare Advantage?
Medicare Advantage may be the better fit if you:
- Are generally healthy and don’t see doctors frequently
- Want to keep monthly costs as low as possible
- Value the convenience of bundled dental, vision, hearing, and drug coverage
- Don’t travel extensively and are comfortable staying within a local network
- Prefer one plan and one card for simplicity
Who Should Choose Medigap?
Medigap may be the better choice if you:
- Have chronic conditions or see specialists regularly
- Want the freedom to see any Medicare-accepting doctor without restrictions
- Travel frequently between states or internationally
- Prefer predictable healthcare costs with no surprises
- Value long-term plan stability and don’t want to review plan changes annually
As Karl Bruns-Kyler, founder of The Big 65 and a licensed Medicare insurance broker with over 20 years of experience, often explains: “The right choice isn’t about which plan type is ‘better’ in the abstract. It’s about which one fits your health situation, budget, and lifestyle. A plan that works perfectly for your neighbor may not work for you.”
Enrollment: When and How to Sign Up
Medicare Advantage Enrollment
You can enroll in a Medicare Advantage plan during:
- Initial Enrollment Period (IEP): The 7-month window around your 65th birthday
- Annual Enrollment Period (AEP): October 15 through December 7 each year
- Medicare Advantage Open Enrollment Period: January 1 through March 31 (for those already in an MA plan)
- Special Enrollment Periods: Triggered by qualifying life events like moving or losing employer coverage
Medigap Enrollment
Your best opportunity to enroll in a Medigap plan is during your 6-month Medigap Open Enrollment Period, which starts the month you turn 65 and are enrolled in Medicare Part B. During this window:
- You have guaranteed-issue rights, meaning no insurer can deny you or charge more based on health conditions
- You can choose any Medigap plan sold in your state
Critical warning: If you miss this window and later decide to switch from Medicare Advantage to Medigap, most states allow insurers to use medical underwriting. This means they can review your health history and potentially deny coverage or charge higher premiums. A few states (Connecticut, Massachusetts, New York, and others) offer protections, but for most people, the initial enrollment decision carries significant long-term weight.
Can You Switch Between Medicare Advantage and Medigap?
Technically, yes. You can drop a Medicare Advantage plan and return to Original Medicare during the Annual Enrollment Period (October 15 to December 7) or the MA Open Enrollment Period (January 1 to March 31).
However, the challenge is getting a Medigap policy after your initial enrollment window has closed. In most states, switching back means facing medical underwriting for Medigap, which can make this transition difficult or expensive if your health has changed. This is why it’s so important to carefully consider your initial choice and understand the long-term implications.
Frequently Asked Questions
Can I have both Medicare Advantage and Medigap at the same time?
No. You must choose one path or the other. If you have a Medicare Advantage plan, a Medigap policy will not pay for any services. You are either on the Medicare Advantage path or the Original Medicare + Medigap path.
Is Medicare Advantage really free?
Not exactly. While many Medicare Advantage plans have $0 plan premiums, you still pay your monthly Part B premium (~$185 in 2026). You also pay copays and coinsurance each time you use services, which can add up to thousands per year depending on your healthcare needs.
Which option is better for someone with a chronic illness?
For most people managing chronic conditions, Medigap combined with Original Medicare tends to offer better value. You get unrestricted specialist access without referrals, no prior authorization delays, and predictable costs regardless of how many appointments or treatments you need. The cost comparison changes significantly when you account for frequent copays under Medicare Advantage.
What is the most popular Medigap plan?
Plan G is the most popular Medigap plan in 2026, chosen by about 39% of Medigap enrollees. It covers nearly all out-of-pocket costs except the annual Part B deductible ($257 in 2026). Learn more about Medigap plan options and rate comparisons here.
Does Medigap cover prescription drugs?
No. Medigap plans do not include prescription drug coverage. If you choose Medigap, you’ll need to enroll in a separate Medicare Part D plan for your medications. Starting in 2026, the Inflation Reduction Act caps annual out-of-pocket drug costs at $2,000 under Part D, making this more affordable than in previous years.
What happens to my Medicare Advantage benefits if I move to a new state?
Medicare Advantage plans are tied to local service areas. If you move outside your plan’s area, you’ll qualify for a Special Enrollment Period to choose a new plan. However, the Medicare Advantage plans available to you will change based on your new location. With Medigap + Original Medicare, you have nationwide coverage and moving doesn’t affect your benefits.
Making Your Decision: A Step-by-Step Approach
- Assess your health needs. List your current doctors, specialists, prescriptions, and how often you use healthcare services.
- Check your doctors. If considering Medicare Advantage, verify that your preferred providers are in the plan’s network.
- Run the numbers. Compare total annual costs (premiums + expected out-of-pocket) for both paths based on your typical healthcare usage.
- Consider your lifestyle. Travel frequency, desire for provider flexibility, and comfort with network restrictions all matter.
- Think long-term. Your health may change. Consider what happens if you need more care in 5 or 10 years.
- Get expert guidance. A licensed, independent Medicare broker like The Big 65 can help you compare your specific options without bias toward any single insurance carrier.
With over 20 years of Medicare expertise and licensing across 33 states, Karl Bruns-Kyler and The Big 65 team provide personalized, independent guidance to help you find the right coverage for your unique situation. Whether you’re leaning toward Medicare Advantage or Medigap, having an experienced advisor in your corner can help you avoid costly mistakes and make a confident decision.