Medicare Advantage vs Medicare Supplement: Which One Is Right for You?
Last reviewed: June 2026 · Reviewed by Galit Sacajiu MD, MPH
This is the most common question people face at 65. You have Original Medicare. Now you need to decide whether to add a Medicare Supplement plan (also called Medigap) or switch to Medicare Advantage instead. The two paths are very different, and the right answer depends on your health, your finances, and how much you travel or value choice in doctors.
Neither option is universally better. What works for your neighbor may not work for you. This guide breaks down the real differences so you can make the call with confidence.
Side-by-Side Comparison
| Feature | Medicare Advantage | Medicare Supplement |
|---|---|---|
| Monthly premium | $0 to ~$50/mo avg | $80 to $200+/mo (varies by age) |
| Part B premium required | Yes ($202.90/mo) | Yes ($202.90/mo) |
| Drug coverage (Part D) | Usually included | Not included — buy separately |
| Doctor networks | In-network required (HMO) or preferred (PPO) | Any doctor that accepts Medicare |
| Referrals to specialists | Required on most HMO plans | Never required |
| Annual out-of-pocket max | Up to $9,350 in-network (2026) | Varies by plan — Plan G covers most costs |
| Predictability of costs | Moderate — copays vary by service | High — costs are largely fixed |
| Extra benefits (dental, vision) | Common on most plans | Not included |
| Coverage when traveling | Limited to network (emergencies only for HMO) | Any Medicare provider nationwide |
| Prior authorizations | Common for tests and procedures | Not required |
| Plan changes | Once a year during AEP | Can switch anytime (may need underwriting) |
| Best for | Healthy people who want low premiums | People who want predictable costs and flexibility |
The Cost Difference
On paper, Medicare Advantage looks much cheaper. The average 2026 premium is $14 per month, and hundreds of plans are available at $0. A Medigap Plan G, by contrast, runs $120 to $200 per month depending on your age and where you live.
The catch with Advantage is that your costs vary with use. Every doctor visit, lab test, or hospital stay comes with a copay. If you have a bad year medically, those copays add up. The plan caps your spending at up to $9,350 in-network in 2026, but reaching that cap is not uncommon for people with serious illnesses.
With Medigap, you pay more upfront in premiums, but there are few surprises when you actually use care. Plan G covers your Part B coinsurance, the Part A deductible, and hospital stays. Most people on Plan G pay only the $283 Part B deductible each year and nothing else out of pocket for covered services.
Medicare Advantage: Cost Example
- Monthly premium: $0
- Part B premium: $202.90
- PCP visit copay: $10
- Specialist copay: $40
- Hospital stay: $350/day (days 1-5)
- Annual OOP max: up to $9,350
Plan G: Cost Example
- Monthly premium: ~$140
- Part B premium: $202.90
- PCP visit: $0 after deductible
- Specialist: $0 after deductible
- Hospital stay: $0 (covered)
- Annual out-of-pocket: $283 deductible only
Doctor Choice and Networks
This is where many people feel the real difference. Medigap works with any doctor or hospital in the country that accepts Medicare. No network, no referral, no prior authorization. You see who you want, when you want.
Medicare Advantage plans have networks. HMO plans require you to use in-network providers for non-emergency care. If you see an out-of-network specialist, you pay the full cost yourself. PPO plans let you go out of network, but at a higher cost-share.
Prior authorizations are another friction point. Advantage plans can require approval before you get an MRI, see a specialist, or have certain procedures. This does not happen with Medigap and Original Medicare.
If you live in a major metro area with a large plan network, doctor access is usually fine with Advantage. If you live in a rural area, split your time between two states, or have established relationships with specific specialists, Medigap is typically the better fit.
Who Each Plan Works Best For
Medicare Advantage tends to work well if you:
- ✓ Are generally healthy and use few specialist services
- ✓ Live in an area with many in-network providers
- ✓ Want $0 or very low monthly premiums
- ✓ Would benefit from dental, vision, or hearing coverage
- ✓ Stay close to home and do not travel extensively
- ✓ Are comfortable with variable copays each visit
Medicare Supplement tends to work well if you:
- ✓ Have chronic conditions or see multiple specialists
- ✓ Want predictable costs with few surprises
- ✓ Travel frequently or spend time in multiple states
- ✓ Prefer choosing any doctor without network restrictions
- ✓ Have planned or anticipated major medical expenses
- ✓ Value not needing referrals or prior authorizations
Timing Matters a Lot with Medigap
There is a critical window for enrolling in a Medigap plan that most people do not know about. During the six months after you first enroll in Part B, insurance companies must sell you any Medigap policy at standard rates regardless of your health. After that window closes, they can charge you more or deny coverage based on your medical history in most states.
This matters if you start with Medicare Advantage and later want to switch to Medigap. At age 65 during your initial enrollment, you have guaranteed access to Medigap. At 70, after years on Advantage, you may not. Insurers can turn you down or price you out.
If you are turning 65 and leaning toward Advantage but have any history of serious illness, talk to a licensed agent about locking in Medigap during your guaranteed issue window. You can always switch to Advantage later. Going the other direction is harder.
Can You Switch Between Them?
Switching from Medigap to Medicare Advantage is easy. During the Annual Enrollment Period (October 15 to December 7), you can drop your Medigap plan, join a Medicare Advantage plan, and your new coverage starts January 1.
Switching from Medicare Advantage back to Medigap is harder, as explained above. You leave Advantage during AEP or the MA Open Enrollment Period (January 1 to March 31), return to Original Medicare, then apply for Medigap. In most states, the insurer reviews your health history and can deny you or charge higher premiums. Massachusetts, Maine, and New York have additional protections that allow open enrollment year-round.
Frequently Asked Questions
Can I have both Medicare Advantage and a Medicare Supplement plan?+
No. Medicare Supplement plans are designed to work alongside Original Medicare (Parts A and B). If you are enrolled in Medicare Advantage, you cannot use a Medigap policy to pay your costs. It is illegal for an insurer to sell you Medigap if they know you are in Medicare Advantage. You must choose one path or the other.
Which is better for someone with diabetes or a heart condition?+
For people managing chronic conditions who see specialists regularly, Medigap typically provides more predictable costs and fewer access barriers. With Advantage, frequent specialist visits mean frequent copays, and prior authorization requirements can slow down care. That said, some Medicare Advantage plans have special benefits for chronic conditions through Special Needs Plans (SNPs). Ask about those specifically if you have a qualifying condition.
Does Medicare Advantage cover care when I travel?+
For emergencies, yes. Medicare Advantage plans cover emergency and urgently needed care anywhere in the U.S. For routine care outside your plan's service area, coverage depends on your plan type. PPOs cover out-of-network care at a higher cost. HMOs generally do not cover non-emergency care outside the network. If you spend several months per year in another state, Medigap with Original Medicare is usually the better choice.
Is Plan G the best Medicare Supplement plan?+
Plan G is currently the most comprehensive Medigap plan available to people who turn 65 in 2020 or later. It covers the Part A deductible, Part B coinsurance, skilled nursing coinsurance, and excess charges. The only cost it does not cover is the Part B deductible ($283 in 2026). Plan N is an alternative with lower premiums but requires copays for some office visits and does not cover excess charges. For most people, G or N is the right comparison to make.
Do I need Part D if I choose a Medicare Supplement plan?+
Yes. Medigap covers gaps in Parts A and B only. It does not include prescription drug coverage. You need to enroll in a separate Part D plan to get drug coverage. If you skip Part D and go without creditable drug coverage, you will owe a permanent late enrollment penalty when you do enroll. Most people on Medigap add a standalone Part D plan at the same time.
Not sure which way to go?
A licensed Medicare agent can compare actual plans and premiums available in your ZIP code at no cost to you. Agents are paid by the insurers, so you pay nothing for the advice.
Talk to a Medicare Agent