What Is the Best Medicare Supplement?
The best Medicare supplement — also called Medigap — is the plan that fills the gaps in Original Medicare (Part A and Part B) without forcing you into a restricted network. In practice, that means comparing standardized plans by their out-of-pocket costs, core benefits, and whether they cover foreign travel emergency care. There is no single winner for everyone; the best plan depends on your health, budget, and whether you want predictability or flexibility.
- What Is the Best Medicare Supplement?
- How Medicare Supplements Work
- Comparing the Core Medigap Plans
- What Is the Best Medicare Supplement for High Deductible Costs?
- What Is the Best Medicare Supplement for Travel?
- Medicare Supplement vs. Medicare Advantage
- How to Choose the Best Medicare Supplement for You
- The Bottom Line
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Medicare Supplement plans are standardized by letter. Every Plan G, for example, offers the same basic coverage regardless of which insurance company sells it. The differences lie in monthly premiums, customer service, and whether the insurer offers additional perks like gym memberships or telehealth.
How Medicare Supplements Work
Original Medicare pays about 80 percent of covered services after you meet your deductible. You are responsible for the remaining 20 percent coinsurance, plus any Part A hospital deductible and excess charges. A Medigap policy picks up those cost-sharing duties, leaving you with predictable, fixed costs for doctor visits and hospital stays.
You must have Medicare Part A and Part B to buy a Medigap policy. The best time to enroll is during your six-month Medigap open enrollment period, which starts the first month you turn 65 and are enrolled in Part B. During that window, insurers cannot deny you coverage or charge you more for preexisting conditions.
Comparing the Core Medigap Plans
The following table covers the standardized Medigap plans most common in 2024. It focuses on what each plan covers and the trade-offs you should weigh when deciding what is the best medicare supplement for your situation.
| Plan | Part A Deductible | Part B Coinsurance (20%) | Skilled Nursing Coinsurance | Foreign Travel Emergency | Part B Excess Charges |
|---|---|---|---|---|---|
| Plan A | No | Yes | No | No | No |
| Plan B | Yes | Yes | No | No | No |
| Plan C | Yes | Yes | Yes | No | No |
| Plan F | Yes | Yes | Yes | No | Yes |
| Plan G | No | Yes | Yes | No | Yes |
| Plan N | No | Yes (copay for ER/office) | Yes | No | No |
Plan F and Plan C are no longer available to people who became eligible for Medicare on or after January 1, 2020. If you are already enrolled in Plan F or Plan C, you can keep it. New enrollees should look at Plan G as the closest equivalent, with the trade-off that you must pay the Part B annual deductible out of pocket.
What Is the Best Medicare Supplement for High Deductible Costs?
If you want to minimize surprise bills, Plan G is often the best medicare supplement for people who want comprehensive coverage without the Part B deductible. You pay the annual deductible once, and then the plan covers nearly everything else. This works well for people who visit doctors frequently or expect regular testing.
Plan N is a lower-cost alternative, but it requires copays for emergency room visits and certain office consultations. If you rarely see a doctor and want to keep monthly premiums low, Plan N can make sense — provided you are comfortable with those out-of-pocket copays.
What Is the Best Medicare Supplement for Travel?
Original Medicare does not cover care you receive outside the United States. If you travel internationally, the best medicare supplement for you will likely be a plan that includes foreign travel emergency coverage. Historically, Plan C and Plan F offered this benefit, but new enrollees cannot purchase them. A few Medigap carriers offer foreign travel coverage as a rider or built into select plans, so you should ask directly when comparing quotes.
Medicare Supplement vs. Medicare Advantage
A Medigap policy and a Medicare Advantage plan are different paths. Original Medicare plus Medigap gives you access to any doctor or hospital that accepts Medicare, nationwide, with no prior authorization required. Medicare Advantage plans bundle Part A, Part B, and often Part D into a single plan, but they use provider networks and require referrals for specialists.
Medicare Advantage plans often have lower monthly premiums, but their out-of-pocket maximums and prior-authorization rules can create unpredictability. Medigap premiums are typically higher, but they offer more freedom to see any accepting provider. The best choice depends on whether you value cost predictability or network flexibility more.
How to Choose the Best Medicare Supplement for You
Start by comparing premiums from at least three insurers for the same plan letter. Because benefits are standardized, the decision comes down to price, financial strength, and customer experience. Look up the insurer's complaint ratio with your state's department of insurance and check whether they offer a competitive rate structure.
Next, consider your health trajectory. If you expect stable health and low utilization, a lower-premium plan like Plan N may be sufficient. If you want to eliminate nearly all cost-sharing, Plan G provides the most complete coverage for new Medicare enrollees.
Finally, review the pricing structure. Medigap policies use community-rated, issue-age-rated, or attained-age-rated premiums. Community-rated plans charge the same premium regardless of age, which usually offers the best long-term value.
The Bottom Line
The best medicare supplement is the one that balances your budget, your health needs, and your willingness to accept out-of-pocket risk. For most new enrollees, Plan G delivers the strongest combination of coverage and cost predictability. If you want the lowest monthly payment and are comfortable with copays, Plan N is a viable alternative. Always compare quotes from multiple carriers for the same plan letter, because premiums can vary by hundreds of dollars a year for identical benefits.