Top 5 Medicare Supplement Plans Compared

Finding the Right Medicare Supplement Plan

Medicare Supplement plans, also called Medigap, fill the gaps in Original Medicare by covering deductibles, coinsurance, and copayments. With ten standardized plan types labeled Plan A through Plan N, the choices can feel overwhelming. The top 5 Medicare supplement plans balance predictable out-of-pocket costs against monthly premiums, and the right pick depends on how often you see doctors, whether you travel, and what you can afford each month. This comparison focuses on the plans most beneficiaries consider when they want solid coverage without paying for benefits they will never use.

How the Top 5 Medicare Supplement Plans Stack Up

The standardized nature of Medigap means Plan F from one company pays the same as Plan F from another, but premiums and customer service vary. The table below summarizes the core coverage and cost profile of the five plans most frequently chosen by Medicare beneficiaries.

Plan G: The Most Popular Choice

Plan G consistently ranks as one of the top 5 Medicare supplement plans because it offers comprehensive coverage with a single, predictable gap: the Part B deductible. Once you pay that annual deductible, Plan G covers all Medicare-approved Part A and Part B coinsurance and copayments, including the 20 percent coinsurance for most doctor services. For beneficiaries who want the peace of mind that comes with near-complete coverage and do not want to track small copayments, Plan G strikes a practical balance. The trade-off is that premiums are higher than Plans K or N, and you must be comfortable paying the Part B deductible out of pocket each year. Because Plan F is closed to new enrollees, Plan G has become the default high-coverage option for those turning 65 or enrolling in Medicare after 2020.

Plan F: The Comprehensive Option With a Catch

Plan F was the gold standard of Medicare supplement coverage for years, covering every deductible, copayment, and coinsurance under Original Medicare. It remains one of the top 5 Medicare supplement plans in name and legacy, but the federal government stopped allowing new Medicare enrollees to sign up for Plan F beginning in 2020. If you were eligible for Medicare before that year and already had Plan F, you can keep it. For everyone else, Plan F is no longer an option. This restriction is the single most important fact to know when evaluating the top 5 Medicare supplement plans, because many people still ask for Plan F without realizing it is unavailable to them as new enrollees.

Plan N: A Lower-Cost Option With Small Copays

Plan N appeals to beneficiaries who want to keep monthly premiums low and do not mind modest out-of-pocket costs at the point of service. With Plan N, you pay a small copay for most doctor office visits, typically around $20, and a copay for emergency room visits that is waived if you are admitted. Preventive care copays are generally not charged under Medicare, so you can use that coverage without extra cost. Plan N covers the same inpatient hospital benefits as Plan G, but it does not cover the Part B deductible, and you are responsible for the Part B excess charge if a doctor bills more than Medicare allows. For healthy people who see their doctor infrequently, Plan N can be one of the most cost-effective choices among the top 5 Medicare supplement plans.

Plan C: High Coverage Before the New Enrollment Cutoff

Plan C covers the Part A deductible, all Part A and Part B coinsurance, and the first three pints of blood, along with the skilled nursing facility coinsurance. Like Plan F, it is closed to new Medicare enrollees because it covers the Part B deductible. If you enrolled in Medicare before 2020, Plan C remains available and can be a strong alternative to Plan F for those who want the Part B deductible covered without paying the highest premiums that Plan F commands. For new enrollees, Plan C is not a viable option, which is why it appears here as a historical reference point rather than a forward-looking recommendation.

Plan K: The Low-Premium, High-Out-of-Pocket Option

Plan K is the most affordable of the top 5 Medicare supplement plans in terms of monthly premiums, but it comes with the highest potential out-of-pocket exposure. It covers 50 percent of Medicare coinsurance for Part A and Part B after you meet the annual deductible, and it has an annual out-of-pocket limit. Once you hit that limit, Plan K pays 100 percent of covered services for the rest of the year. Plan K also covers the skilled nursing facility coinsurance and foreign travel emergency benefits. The trade-off is clear: you will pay more at the doctor's office and hospital throughout the year, but the monthly bill stays low. Plan K makes sense for people who rarely use healthcare services and want catastrophic protection without a high premium.

What to Consider When Choosing Among the Top 5

Several factors shape which of the top 5 Medicare supplement plans fits your situation. First, look at your health usage. If you visit specialists often or expect surgery, a plan with minimal copays like Plan G reduces surprise bills. If you are generally healthy, Plan N or Plan K can save you money on premiums. Second, consider your budget for the Part B deductible, which changes each year. Third, check whether your doctors accept Medicare assignment, because Plan N and Plan K do not cover the excess charge some providers bill above the Medicare-approved amount. Fourth, think about travel; all five plans include foreign travel emergency coverage, but the duration and limits matter if you spend extended time abroad.

Understanding Premium Structures

Medigap premiums vary by insurer, location, age, and tobacco use. Community-rated plans charge the same premium regardless of age, while issue-age plans base the premium on your age when you first buy the policy. Attained-age plans raise premiums as you get older. A plan with a lower premium today may cost more over time than a plan with a higher starting premium but a community-rate structure. Comparing the top 5 Medicare supplement plans is not just about coverage; it is about how the premium pattern interacts with your long-term budget.

Guaranteed Issue Rights and Switching

You have guaranteed issue rights when you first enroll in Medicare Part B, when you lose employer coverage, or in certain other life changes. During these windows, insurers cannot deny you or charge more for preexisting conditions. Outside those windows, companies can use medical underwriting. If you already have a Medicare supplement plan, you can switch to a different plan, but the new company may ask health questions and decline coverage or defer it. Understanding these rules helps you move confidently among the top 5 Medicare supplement plans without losing your right to enroll.

Making Your Final Decision

The best Medicare supplement plan is the one that aligns your expected healthcare use with your budget for premiums and out-of-pocket costs. Plan G offers the broadest coverage for new enrollees. Plan N delivers lower premiums with small copays. Plan K keeps monthly costs low but shifts more risk to you. Review the annual deductible and coinsurance amounts under Medicare, compare premium quotes from several insurers, and confirm that your doctors accept the plan. By weighing coverage gaps against what you will actually pay, you can choose with confidence from the top 5 Medicare supplement plans and avoid paying for benefits you will never need.