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Medicare Supplement Plans: Your Complete Medigap Guide

By New Jersey Medicare Advisory • May 27, 2026

Medicare Supplement Plans: Your Complete 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 standardized plans help fill the "gaps" in Original Medicare coverage, giving you more predictable healthcare costs and greater peace of mind.

How Medigap Works With Original Medicare

Medigap policies are sold by private insurance companies but follow federal and state regulations to ensure standardization. When you have a Medigap plan, it works alongside your Original Medicare coverage. Here's how it typically works: Medicare pays its share of approved healthcare costs first, then your Medigap policy pays its share according to your plan's benefits.

It's important to understand that Medigap only works with Original Medicare—not with Medicare Advantage plans. You cannot have both a Medicare Advantage plan and a Medigap policy at the same time. Medigap policies also don't include prescription drug coverage, so you'll need to enroll in a separate Part D plan if you want medication coverage.

One significant advantage of Medigap is that these policies are accepted by any doctor or hospital that accepts Medicare, giving you nationwide coverage without network restrictions. This makes Medigap particularly valuable if you travel frequently or spend time in different states.

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 standardized benefit package, and the benefits are the same regardless of which insurance company sells it. 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 the most comprehensive option available to most new Medicare beneficiaries. It covers nearly all out-of-pocket costs except the Part B deductible.

Plan N offers robust coverage at typically lower premiums but requires small copayments for certain doctor visits and emergency room visits that don't result in admission.

Plans K and L provide partial coverage of Medicare cost-sharing and have lower premiums, but you'll pay more out-of-pocket until you reach an annual limit.

High-deductible Plan G requires you to pay a deductible before coverage begins, but it comes with significantly lower monthly premiums.

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 Guaranteed Issue Rights

Medigap premiums vary based on several factors, including your location, age, tobacco use, and the insurance company you choose. In New Jersey, Medigap policies follow specific state regulations that may affect pricing and availability.

The best time to buy a Medigap policy is during your Medigap Open Enrollment Period—a six-month window that starts when 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 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 other coverage through no fault of your own, when your Medicare Advantage plan leaves your area, or when you move out of your plan's service area.

Choosing the Right Medigap Plan for Your Needs

Selecting the right Medigap plan requires balancing your healthcare needs, budget, and personal preferences. Consider these factors:

  • How often do you visit doctors or specialists?
  • Do you have ongoing health conditions requiring regular care?
  • What's your budget for monthly premiums versus potential out-of-pocket costs?
  • Do you travel frequently or spend time outside New Jersey?

Comparing plans from multiple insurance companies is essential, as premiums can vary significantly even for identical coverage. Don't just focus on the lowest premium—consider the company's reputation, customer service, and rate increase history.

Get Expert Help Choosing Your Medigap Plan

Navigating Medicare Supplement options can feel overwhelming, but you don't have to do it alone. The licensed advisors at New Jersey Medicare Advisory understand the unique considerations for New Jersey residents and can help you compare plans, understand your rights, and find coverage that fits your needs and budget.

Ready to explore your Medigap options? Call New Jersey Medicare Advisory at 856-221-7051 to speak with a knowledgeable Medicare advisor who can provide personalized guidance at no cost to you.