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Medicare Supplement Plans Explained: Your NJ Medigap Guide

By New Jersey Medicare Advisory • May 26, 2026

What Are Medicare Supplement (Medigap) Plans?

If you have Original Medicare (Parts A and B), you've probably noticed 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 sold by private insurance companies and are designed to help fill the "gaps" in Original Medicare coverage.

Medigap policies work alongside Original Medicare, not as a replacement. When you receive healthcare services, Original Medicare pays its share first, and then your Medigap policy pays its share of the remaining costs according to your plan. This coordination can significantly reduce your out-of-pocket expenses and make healthcare costs more predictable.

Understanding the Standardized Plan Letters

One of the most helpful aspects of Medigap is standardization. In most states, including New Jersey, Medigap policies are standardized and identified by 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 policy.

For example, a Plan G from one company offers the exact same coverage as Plan G from another company—the only differences are the premium cost and customer service. This standardization makes it much easier to compare plans and find the best value.

Popular plan options include:

  • Plan G: Currently one of the most comprehensive options available to new Medicare beneficiaries, covering most out-of-pocket costs except the Part B deductible
  • Plan N: Offers solid coverage with lower premiums, though you'll pay small copayments for some doctor visits and emergency room visits
  • High-deductible Plan G: Features lower monthly premiums but requires you to pay a deductible before coverage kicks in
  • Plans K and L: Cost-sharing plans with lower premiums that cover a percentage of costs rather than all costs

It's important to note that Plans C and F are no longer available to people who became eligible for Medicare on or after January 1, 2020, though those who already have these plans can keep them.

Monthly Premiums and What Affects Your Costs

Medigap premiums vary based on several factors. Insurance companies may price their policies using different methods: some base premiums on your age when you buy the policy, others increase premiums as you get older, and some charge everyone the same rate regardless of age.

Your location within New Jersey can also affect your premium, as can tobacco use. However, in New Jersey, insurance companies cannot deny you coverage or charge you more based on pre-existing health conditions if you apply during certain protected enrollment periods.

While monthly premiums are an important consideration, it's equally important to think about your total potential healthcare costs. A plan with a lower premium might cost you more overall if you have significant out-of-pocket expenses. Conversely, a higher premium plan might provide better value if it covers more of your costs.

Guaranteed Issue Rights and When to Enroll

Timing matters when it comes to Medigap. Your best opportunity 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 health problems.

You may also have guaranteed issue rights in certain special situations, such as when you lose employer coverage, when your Medicare Advantage plan leaves your area, or when you move out of your plan's service area.

Making the Right Choice for Your Situation

Choosing the right Medigap plan depends on your individual circumstances, including your health status, budget, doctors you see, and risk tolerance. Consider how often you visit doctors, whether you travel frequently, and how much financial predictability you want.

Remember that you cannot be enrolled in both a Medigap policy and a Medicare Advantage plan—you must choose one path or the other.

Get Expert Help Choosing Your Medigap Plan

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, compare plans, and find coverage that fits your needs and budget. We'll walk you through the plan letters, explain the differences, and help you make an informed decision.

Call us today at 856-221-7051 for a free consultation. Let's find the right Medigap plan for you.