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Medicare Supplement Plans Explained: Your NJ Medigap Guide

By New Jersey Medicare Advisory • May 23, 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, coinsurance, and copayments can add up quickly. That's where Medicare Supplement Insurance, commonly called Medigap, comes in. These standardized plans 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 and work alongside Original Medicare. Here's how it works: Medicare pays its share of approved healthcare costs first, then your Medigap policy pays its share according to your plan's benefits. This coordination means you typically have fewer out-of-pocket expenses when you visit the doctor or need hospital care.

It's important to understand that Medigap only works with Original Medicare. If you're enrolled in a Medicare Advantage plan (Part C), you cannot use a Medigap policy. Additionally, Medigap policies don't include prescription drug coverage, so you'll need to enroll in a separate Part D plan if you want medication coverage.

Understanding the Standardized Plan Letters

Medigap policies are standardized by the federal government and labeled with letters: A, B, C, D, F, G, K, L, M, and N. Each letter represents a different set of benefits, and these benefits are the same regardless of which insurance company sells the plan. For example, Plan G from one company offers the same coverage as Plan G from another company—though the premiums may differ.

Here's what you should know about the most popular plans:

Plan G has become one of the most popular choices because it offers comprehensive coverage. It covers most out-of-pocket costs except the Medicare Part B deductible.

Plan N typically has lower monthly premiums but requires small copayments for some doctor visits and emergency room visits that don't result in admission.

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.

Plan F offers the most comprehensive coverage but is only available to those who became eligible for Medicare before January 1, 2020.

Plans C and F are being phased out for new Medicare beneficiaries, though those already enrolled can keep their plans.

Monthly Premiums and Cost Considerations

Medigap premiums vary based on several factors, including which plan letter you choose, where you live in New Jersey, your age, and which insurance company you select. Insurance companies 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

While it's tempting to choose the plan with the lowest premium, remember to consider the total cost of care. A plan with a slightly higher premium might save you money overall if you frequently need medical services. Working with a licensed Medicare advisor can help you compare options based on your specific healthcare needs and budget.

Guaranteed Issue Rights and When to Enroll

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 period, you have guaranteed issue rights—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 lose employer coverage or if your Medicare Advantage plan is leaving your area. These protections are important because outside of guaranteed issue periods, insurance companies in most states can use medical underwriting, potentially denying coverage or charging higher premiums based on your health status.

Making the Right Choice for Your Needs

Choosing the right Medigap plan depends on your individual circumstances. Consider factors like how often you visit doctors, whether you travel frequently, your budget for monthly premiums versus out-of-pocket costs, and your overall health status.

Remember that you can switch Medigap plans, but outside your initial enrollment period, you may face medical underwriting. That's why it's crucial to choose carefully from the start.

Get Expert Guidance Today

Navigating Medicare Supplement options doesn't have to be overwhelming. The licensed advisors at New Jersey Medicare Advisory are here to help you understand your options and find the plan that best fits your needs and budget. We'll answer your questions and guide you through the enrollment process with no pressure or obligation.

Call us today at 856-221-7051 to schedule your free consultation and take the first step toward comprehensive Medicare coverage.