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Medicare Supplement Plans Explained: Your NJ Medigap Guide

By New Jersey Medicare Advisory • June 2, 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 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—only the price and customer service may differ.

When you have a Medigap policy alongside Original Medicare, here's how it works: Medicare pays its share of the Medicare-approved amount for covered healthcare services, and then your Medigap policy pays its share. Depending on which plan you choose, you may have little to no out-of-pocket costs when you receive care. Medigap policies don't cover prescription drugs, so you'll need a separate Part D plan for medication coverage.

Understanding the 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. Here's what you should know:

Plans F and C were the most comprehensive options but are no longer available to people who became eligible for Medicare on or after January 1, 2020. If you were eligible before this date, you may still be able to purchase these plans.

Plan G has become one of the most popular choices because it covers nearly everything Plan F does, except for the Part B deductible. Many New Jersey residents find this plan offers excellent coverage with manageable premiums.

Plan N provides solid coverage at a lower premium than Plan G, but you'll pay small copayments for 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.

Plans A, B, D, and M offer varying levels of coverage, with Plan A being the most basic.

It's important to remember that while benefits are standardized, premiums vary significantly between insurance companies. Shopping around and comparing prices is essential.

Monthly Premiums and Guaranteed Issue Rights

Medigap premiums depend on several factors, including which plan you choose, which insurance company you select, and where you live in New Jersey. Insurance companies may use different pricing methods—some base premiums on your age, others on the date you purchased the policy, and some charge everyone the same rate regardless of age.

The best time to buy a Medigap policy is during your Medigap Open Enrollment Period, which lasts for six months and begins the month you're 65 or older and enrolled in Medicare Part B. During this period, you have guaranteed issue rights, meaning insurance companies cannot deny you coverage, charge you more, or make you wait for coverage to start 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 discontinued. Understanding these rights can save you money and ensure you get the coverage you need.

How to Choose the Right Medigap Plan

Choosing the right Medigap plan depends on your individual healthcare needs, budget, and preferences. Consider these factors:

  • Your health status and expected medical needs: If you visit doctors frequently or have ongoing health conditions, a more comprehensive plan might save you money in the long run.
  • Your budget: Balance monthly premiums against potential out-of-pocket costs. A lower premium might mean higher costs when you need care.
  • Your preferred doctors and hospitals: Medigap plans work with any doctor or hospital that accepts Medicare, giving you nationwide coverage.
  • Future travel plans: If you travel frequently, especially outside the U.S., some Medigap plans offer foreign travel emergency coverage.

Get Expert Help Choosing Your Medigap Plan

Navigating Medicare Supplement options can feel overwhelming, but you don't have to do it alone. Every New Jersey resident's situation is unique, and what works for your neighbor might not be the best choice for you.

The licensed Medicare advisors at New Jersey Medicare Advisory are here to help you understand your options, compare plans from multiple carriers, and find coverage that fits your needs and budget. We'll answer your questions in plain language and guide you through the enrollment process.

Call us today at 856-221-7051 to schedule a no-obligation consultation and discover which Medigap plan is right for you.