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Medicare Supplement Guide: Choosing the Right Medigap Plan

By New Jersey Medicare Advisory • April 30, 2026

Medicare Supplement Guide: Choosing the Right Medigap Plan

If you're enrolled in Original Medicare (Parts A and B), you've probably noticed that it doesn't cover everything. Deductibles, copayments, and coinsurance can add up quickly. That's where Medicare Supplement Insurance, commonly called Medigap, comes in. These standardized policies help cover the out-of-pocket costs that Original Medicare doesn't pay, giving you more predictable healthcare expenses and greater peace of mind.

How Medicare Supplement Plans Work

Medigap policies are sold by private insurance companies but are standardized by the federal government. This means that a Plan G from one company offers the same basic benefits as a Plan G from another company—though premiums may differ. These policies work alongside Original Medicare, not in place of it. When you receive healthcare services, Original Medicare pays its share first, then your Medigap policy pays its share of the remaining costs according to your plan's benefits.

It's important to understand that Medigap policies only work with Original Medicare. If you're enrolled in a Medicare Advantage plan (Part C), you cannot use a Medicare Supplement policy. Additionally, Medigap doesn't cover prescription drugs, so most people also enroll in a standalone Part D plan for medication coverage.

Understanding Standardized Plan Letters

Medigap policies are identified by letters: A, B, C, D, F, G, K, L, M, and N. Each letter represents a different set of standardized benefits. Plans F and C are no longer available to people who became eligible for Medicare after January 1, 2020, but existing enrollees can keep their plans.

High-Coverage Plans: Plans F and G offer the most comprehensive coverage. Plan G is now the most popular choice among new Medicare beneficiaries because it covers nearly all out-of-pocket costs except the Part B deductible. Plan N is another popular option that provides substantial coverage while typically offering lower premiums, though it may require small copayments for doctor visits and emergency room visits.

Moderate-Coverage Plans: Plans D and M offer moderate levels of coverage with lower premiums. These plans require you to pay a larger share of certain costs but still provide valuable protection against high medical expenses.

Lower-Coverage Plans: Plans K and L offer basic coverage and feature lower monthly premiums, but they only cover a percentage of your costs until you reach an annual out-of-pocket limit. After that limit, these plans pay 100% of covered services for the rest of the year.

Monthly Premiums and Guaranteed Issue Rights

Medigap premiums vary based on several factors, including which plan letter you choose, which insurance company you select, where you live, and sometimes your age and tobacco use. While one company might charge significantly more than another for the identical plan, the benefits remain the same across all carriers.

The best time to buy a Medigap policy is during your Medigap Open Enrollment Period, which lasts for six months and begins when you're both 65 or older and enrolled in Medicare Part B. During this period, you have guaranteed issue rights—meaning insurance companies cannot deny you coverage or charge you more due to pre-existing health conditions.

Certain situations also trigger guaranteed issue rights outside of this initial enrollment period, such as when you lose employer coverage or when your Medicare Advantage plan leaves your area. Understanding these rights is crucial to ensuring you can obtain the coverage you need.

Choosing the Right Medigap Plan for You

Selecting the right Medicare Supplement plan depends on your individual circumstances, including your health status, budget, doctors you see, and how much financial predictability you want. Consider these factors:

  • Healthcare utilization: If you visit doctors frequently or have ongoing health conditions, a more comprehensive plan might provide better value despite higher premiums.
  • Budget: Balance your monthly premium with potential out-of-pocket costs to find a plan that fits your financial situation.
  • Travel habits: Medigap plans often provide better coverage for healthcare received outside your area or even abroad.
  • Future needs: Remember that medical underwriting may apply if you want to switch plans later, so choosing wisely now is important.

Get Personalized Help Today

Choosing the right Medicare Supplement plan is an important decision that affects both your healthcare and your finances. Every person's situation is unique, and what works for your neighbor might not be the best choice for you. Our licensed Medicare advisors at New Jersey Medicare Advisory are here to help you compare plans, understand your options, and find coverage that meets your specific needs. Call us today at 856-221-7051 for a free, no-obligation consultation.