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Your Guide to Medicare Supplement Plans in New Jersey

By New Jersey Medicare Advisory • May 13, 2026

Your Guide to Medicare Supplement Plans in New Jersey

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 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 federal law. 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 only works with Original Medicare. If you're enrolled in a Medicare Advantage plan (Part C), you cannot use a Medigap policy. You must have both Medicare Part A and Part B to purchase a Medigap policy.

Understanding the Standardized Plan Letters

Medigap plans are identified by letters: A, B, C, D, F, G, K, L, M, and N. Each letter represents a different set of standardized benefits. Here's what you should know:

Plans G and N are among the most popular choices today. Plan G offers comprehensive coverage, paying for most out-of-pocket costs except the Part B deductible. Plan N also provides strong coverage but requires small copayments for certain doctor visits and emergency room visits.

Plan F offers the most comprehensive coverage, including the Part B deductible, but it's only available to those who became eligible for Medicare before January 1, 2020.

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.

Plans A, B, C, D, and M offer varying levels of coverage between the high-coverage and cost-sharing options.

In New Jersey, you have access to most of these standardized plans, though not every insurance company offers every plan letter. The key is finding the right balance between monthly premiums and coverage that suits your healthcare needs and budget.

Monthly Premiums and What Affects Them

While Medigap benefits are standardized, premiums are not. Several factors influence what you'll pay each month:

Insurance company: Different companies charge different rates for the same plan letter, so it pays to compare.

Pricing method: Companies use different methods to set premiums—community-rated (same for everyone), issue-age-rated (based on your age when you buy), or attained-age-rated (increases as you get older).

Location: Where you live in New Jersey can affect your premium.

Tobacco use: Some companies charge higher premiums for tobacco users.

Discounts: You may qualify for household discounts or other savings.

Remember that the lowest premium isn't always the best value. Consider the insurance company's reputation, customer service, and rate increase history.

Guaranteed Issue Rights and When to Enroll

The best time to buy a Medigap policy is during your Medigap Open Enrollment Period, which lasts 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 also have guaranteed issue rights in certain special situations, such as when you lose employer coverage, when your Medicare Advantage plan leaves the area, or when your Medigap company goes bankrupt.

Outside these protected periods, insurance companies in New Jersey can use medical underwriting, potentially denying coverage or charging higher premiums based on your health status.

Making Your Decision

Choosing the right Medigap plan is an important decision that depends on your individual circumstances, healthcare needs, budget, and preferences. Consider your current health, medications, preferred doctors, and financial situation. Think about whether you value comprehensive coverage with higher premiums or prefer lower premiums with some cost-sharing.

Because everyone's situation is unique, we strongly recommend speaking with a licensed Medicare advisor who can review your specific needs and help you compare plans available in your area. The team at New Jersey Medicare Advisory is here to help you navigate your options at no cost to you. Call us at 856-221-7051 to schedule a consultation and find the Medigap plan that's right for you.