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Medicare Supplement Plans Explained: Your NJ Medigap Guide

By New Jersey Medicare Advisory • May 30, 2026

Medicare Supplement Plans Explained: Your NJ Medigap Guide

If you're enrolled in Original Medicare (Parts A and B), you've probably noticed 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, providing financial peace of mind and predictable healthcare costs.

What Is Medigap and How Does It Work?

Medigap policies are sold by private insurance companies to supplement Original Medicare coverage. When you visit a doctor or hospital, Original Medicare pays its share of approved costs first, then your Medigap policy pays its share according to your plan type. This coordination means you typically pay less out-of-pocket when you receive care.

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. Additionally, Medigap policies don't include prescription drug coverage, so most people also enroll in a separate Part D plan for medications.

Medigap plans are accepted by any provider that accepts Original Medicare, giving you nationwide coverage without network restrictions. This flexibility is especially valuable if you travel frequently or spend time in multiple states.

Understanding the Standardized Medigap Plan Letters

Medigap policies are standardized by the federal government and identified by letters. Each plan letter offers the same benefits regardless of which insurance company sells it, though premiums vary by insurer. Here's what you need to know about the available plans:

Plans F and C were the most comprehensive options but are no longer available to people who became Medicare-eligible after January 1, 2020. Those who enrolled earlier may keep these plans.

Plan G has become the most popular choice for new enrollees. It offers comprehensive coverage similar to Plan F but requires you to pay the Part B deductible yourself.

Plan N provides solid coverage at typically lower premiums but includes small copayments for some doctor visits and emergency room visits that don't result in admission.

Plans A and B offer basic coverage and are less common choices today.

Plan D provides moderate coverage, including the Part A deductible but not the Part B deductible.

Plans K, L, and M offer partial coverage of certain benefits, resulting in lower monthly premiums but higher cost-sharing when you use services.

When comparing plans, remember that the coverage for each letter is identical across all insurance companies—the difference lies in the monthly premium and the company's customer service reputation.

Monthly Premiums and Guaranteed Issue Rights

Medigap premiums vary based on several factors, including which insurance company you choose, where you live in New Jersey, your age, and whether you use tobacco. 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

Your Medigap Open Enrollment Period is the best time to purchase a policy. This six-month window begins when you're both 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 more due to health conditions.

Certain situations also trigger guaranteed issue rights outside this initial enrollment period, such as losing employer coverage, moving out of a Medicare Advantage plan's service area, or when your insurance company goes bankrupt.

Choosing the Right Medigap Plan for Your Needs

Selecting a Medigap plan depends on your individual circumstances, healthcare needs, and budget. Consider these factors:

  • Healthcare usage: Do you visit doctors frequently or have ongoing health conditions?
  • Budget: Can you afford higher monthly premiums for more comprehensive coverage, or would you prefer lower premiums with some cost-sharing?
  • Travel habits: Do you spend significant time outside New Jersey?
  • Future planning: How might your health needs change in coming years?

Don't focus solely on price. While premium cost matters, also consider the insurance company's reputation, financial stability, and customer service quality. A slightly higher premium might be worthwhile for better service and reliability.

Get Expert Guidance for Your Medigap Decision

Choosing the right Medicare Supplement plan is an important decision that affects both your healthcare coverage and your budget. The standardized nature of Medigap plans makes comparison easier, but understanding which plan fits your unique situation requires careful consideration.

At New Jersey Medicare Advisory, we help New Jersey residents navigate their Medicare options every day. Our licensed advisors can explain your choices, compare plans available in your area, and help you enroll during your guaranteed issue period. Best of all, our services come at no cost to you.

Ready to find the right Medigap plan? Call us today at 856-221-7051 to speak with a knowledgeable Medicare advisor who can answer your questions and guide you toward the coverage that best meets your needs.