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Medicare Supplement Plans Explained: Your NJ Medigap Guide

By New Jersey Medicare Advisory • June 1, 2026

Medicare Supplement Plans Explained: Your NJ Medigap Guide

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 policies are designed to help fill the "gaps" in Original Medicare coverage, giving you more predictable healthcare costs and greater peace of mind.

What Is Medigap and How Does It 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.

Here's how it works: 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. You'll typically show both your red, white, and blue Medicare card and your Medigap insurance card when receiving services.

It's important to note that Medigap only works with Original Medicare. If you're enrolled in a Medicare Advantage plan (Part C), you cannot use a Medigap policy, as Medicare Advantage plans already include coverage that works differently from Original Medicare.

Understanding the Standardized Plan Letters

Medigap policies are identified by letters, and each letter represents a different set of standardized benefits. In New Jersey, you'll find plans labeled A, B, C, D, F, G, K, L, M, and N. Here's what you should know:

Plans F and G are among the most comprehensive options. Plan F covers nearly all out-of-pocket costs, but it's only available to those who became eligible for Medicare before January 1, 2020. Plan G has become the most popular choice for new Medicare beneficiaries because it offers comprehensive coverage with the exception of the Part B deductible.

Plan N provides solid coverage at typically lower premiums, though you'll pay small copayments for doctor visits and emergency room visits (unless you're admitted).

Plans K and L offer lower premiums but require you to pay a percentage of costs until you reach an annual out-of-pocket limit, after which the plan pays 100% of covered services.

Plans A, B, C, D, and M offer varying levels of coverage between the most and least comprehensive options. Plan C, like Plan F, is only available to those who became Medicare-eligible before 2020.

The key is understanding that more comprehensive coverage typically means higher monthly premiums, while plans with lower premiums usually mean you'll pay more out-of-pocket when you receive care.

Monthly Premiums and Guaranteed Issue Rights

Medigap premiums vary based on several factors, including which insurance company you choose, where you live in New Jersey, your age, and whether you use tobacco. Insurance companies may use different pricing methods:

  • Community-rated: Everyone pays the same premium regardless of age
  • Issue-age-rated: Your premium is based on your age when you buy the policy
  • Attained-age-rated: Premiums increase as you get older

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 65 or older and enrolled in Medicare Part B. During this time, you have guaranteed issue rights, meaning insurance companies cannot deny you coverage or charge you more due to pre-existing health conditions.

You may also have guaranteed issue rights in certain special situations, such as when you're losing other coverage through no fault of your own, or when your Medicare Advantage plan leaves your area.

Choosing the Right Medigap Plan for You

Selecting a Medigap policy is a personal decision that depends on your healthcare needs, budget, and preferences. Consider these factors:

  • How often do you visit doctors or specialists?
  • Do you prefer predictable costs or are you comfortable with some variability?
  • What's your budget for monthly premiums versus out-of-pocket costs?
  • Do you travel frequently and want coverage nationwide?

Remember, you can only be enrolled in one Medigap policy at a time, and these policies don't include prescription drug coverage. You'll need to enroll in a separate Medicare Part D plan for prescription coverage.

Get Personalized Help Choosing Your Medigap Plan

Navigating Medicare Supplement options doesn't have to be overwhelming. Every person's situation is unique, and what works for your neighbor might not be the best fit for you. A licensed Medicare advisor can review your specific needs, compare plans available in your area, and help you understand the true costs and benefits of each option.

The team at New Jersey Medicare Advisory is here to help you make an informed decision about your Medigap coverage. Call us today at 856-221-7051 to schedule a no-obligation consultation and find the Medicare Supplement plan that's right for you.