Once you understand the basics of Medicare, most people face one big follow-up question:
Do I go with Medicare Advantage, or do I stick with Original Medicare and add a Medigap plan?
This is one of the most consequential Medicare decisions you will make. The two paths work very differently, and switching later can be complicated — especially with Medigap.
This page explains both options side by side so you can make an informed choice. If you are still learning the basics, start with our Medicare Advantage vs. Original Medicare guide first.
Two Paths From Original Medicare
Original Medicare (Part A and Part B) covers a lot — but not everything. It leaves gaps: deductibles, coinsurance, and costs that can add up quickly without a limit.
To fill those gaps, most people choose one of two approaches:
- Medigap (Medicare Supplement Insurance) — keep Original Medicare and add a private plan that covers most of the gaps
- Medicare Advantage (Part C) — replace Original Medicare with an all-in-one private plan that bundles coverage and often adds extra benefits
These are not the same thing. They are fundamentally different structures with different trade-offs.
What Is Medigap?
Medigap — also called Medicare Supplement Insurance — is a private insurance policy that works alongside Original Medicare.
You keep Original Medicare as your primary coverage. Medigap then steps in to pay some or most of the costs that Original Medicare does not cover, such as:
- Part A and Part B deductibles
- The 20% coinsurance you normally owe for Part B services
- Hospital costs beyond what Part A covers
- Some foreign travel emergency coverage (depending on the plan)
Medigap plans are standardized in most states — meaning Plan G from one insurer covers the same benefits as Plan G from another. What differs is the premium. Plan G is the most comprehensive plan available to new enrollees. Plan N has a lower premium but includes some copays.
One important note: Medigap does not include prescription drug coverage. If you have Medigap, you need a separate Part D plan for medications.
What Is Medicare Advantage?
Medicare Advantage (Part C) is a different approach entirely. Instead of supplementing Original Medicare, it replaces it.
You still technically have Medicare, but your coverage is delivered through a private insurance company approved by Medicare. The plan must cover everything Original Medicare covers — and most plans add extras like dental, vision, and hearing coverage.
Most Medicare Advantage plans also include prescription drug coverage, so you typically do not need a separate Part D plan.
The trade-off: Medicare Advantage plans use provider networks. In many plans, you need to use in-network doctors and hospitals. In HMO plans, you often need a referral to see a specialist.
Key Differences: A Direct Comparison
Monthly Premium
- Medicare Advantage: Often $0 or low additional premium (you still pay Part B)
- Medigap: Higher monthly premium — often $100–$200+ per month — but it reduces unpredictable out-of-pocket costs
Provider Choice
- Medicare Advantage: Usually restricted to a network. Going out of network may cost more or not be covered at all (HMO plans)
- Medigap: Any doctor or hospital that accepts Medicare nationwide — no network restrictions
Out-of-Pocket Costs
- Medicare Advantage: Has an annual out-of-pocket maximum (up to around $9,350 in-network in 2026). Costs vary by plan and usage.
- Medigap: A strong plan like Plan G can reduce out-of-pocket costs to near zero for covered services. More predictable, but you pay more upfront in premiums.
Referrals
- Medicare Advantage (HMO): Usually requires a referral from your primary care doctor to see a specialist
- Medicare Advantage (PPO): More flexible — referrals often not required, but out-of-network costs are higher
- Medigap: No referrals needed — you see any Medicare-accepting provider directly
Travel Coverage
- Medicare Advantage: Coverage is generally limited to your plan’s service area. Traveling across states or internationally can leave gaps.
- Medigap: Original Medicare works nationwide. Some Medigap plans also cover emergency care abroad — a significant advantage for frequent travelers.
Prescription Drug Coverage
- Medicare Advantage: Usually included in the plan
- Medigap: Not included — you must add a separate Part D plan
Extra Benefits
- Medicare Advantage: Many plans include dental, vision, hearing, and fitness programs
- Medigap: No extra benefits — coverage is limited to Medicare-covered services
Medicare rules can vary based on your situation, so it’s important to review your options carefully.
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Who Medicare Advantage May Fit Best
Medicare Advantage tends to work well for people who:
- Want to keep monthly costs low and are comfortable with a network
- Value bundled coverage — drugs, dental, vision — in one plan
- Have doctors they see regularly who are in-network
- Live in one area and do not travel extensively
- Are generally healthy and have lower expected healthcare use
Who Medigap May Fit Best
Medigap tends to work well for people who:
- Want the freedom to see any Medicare-accepting doctor without referrals
- Have significant or complex health needs and want predictable costs
- Travel often — across states or internationally
- Prefer paying a higher premium in exchange for lower surprise costs
- Want to enroll when they are first eligible — Medigap has guaranteed issue rights during your Medigap Open Enrollment Period (the 6 months after Part B starts). After that window, insurers can charge more or deny coverage based on health.
The Honest Answer: It Depends on You
There is no objectively better option. The right choice depends on:
- Your health — current conditions, expected care needs, medications
- Your budget — what you can afford in monthly premiums vs. what risk you can absorb
- Your doctors — are they in-network for the Advantage plans in your area?
- Your lifestyle — do you travel, split time between states, or live rurally?
- Your priorities — flexibility or simplicity?
This decision is also harder to reverse than it looks. Switching from Medicare Advantage back to Medigap later can be difficult — in most states, you lose guaranteed issue rights after your initial enrollment window, meaning insurers can reject you or charge higher premiums based on health history.
Getting it right the first time matters.
Bottom Line
Medicare Advantage and Medigap both have real advantages — and real limitations. Neither is universally better.
- If lower monthly costs and bundled benefits matter most → Medicare Advantage may be the better fit
- If flexibility, predictable costs, and nationwide coverage matter most → Medigap may be the better fit
For more on Medicare enrollment timing — including how to avoid late enrollment penalties — see our Medicare Enrollment Deadlines and Penalties guide. If you are new to Medicare and evaluating your options, our Turning 65 Medicare guide is a good starting point. If you are already enrolled and want to switch between Medicare Advantage and Original Medicare, the Annual Enrollment Period (October 15 – December 7) is the standard window for that change. You can also explore the full Medicare guide for everything in one place.
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Every Medicare situation is different. Our partner Chapter Medicare offers free one-on-one help from licensed advisors who can compare options based on your doctors, prescriptions, and budget.
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Disclosure: We may receive a referral from Chapter if you choose to use their service. Chapter is a licensed health insurance agency and is not affiliated with or endorsed by Medicare or any government agency.