New Jersey Medicare AdvisoryBy New Jersey Medicare Advisory • April 25, 2026
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 standardized plans, sold by private insurance companies, help fill the "gaps" in Original Medicare coverage, giving you more predictable healthcare costs and greater peace of mind.
Medigap policies work alongside Original Medicare, not as a replacement. 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. This partnership means you'll typically have fewer out-of-pocket expenses when you visit the doctor or hospital.
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, and it's actually illegal for an insurance company to sell you one if they know you have Medicare Advantage coverage. Medigap also doesn't cover prescription drugs—for that, you'll need a separate Part D plan.
Medigap policies are standardized by the federal government and labeled with 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 plan. For example, Plan G from one company offers the exact 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 solid coverage at typically lower premiums but requires small copayments for some doctor visits and emergency room visits that don't result in admission.
Plans K and L are high-deductible options that cover a percentage of costs (K covers 50%, L covers 75%) until you reach an annual out-of-pocket limit.
Plan F offers the most comprehensive coverage but is only available to those who became eligible for Medicare before January 1, 2020.
The other plans (A, B, C, D, and M) offer varying levels of coverage and may appeal to different budgetary and healthcare needs.
Medigap premiums vary based on several factors, including which plan letter you choose, which insurance company you select, where you live in New Jersey, and sometimes your age and tobacco use. Generally, plans with more comprehensive coverage have higher monthly premiums, while plans with cost-sharing features have lower premiums.
The best time to enroll in a Medigap policy is during your Medigap Open Enrollment Period—a six-month window that begins the month you're both 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're losing other coverage through no fault of your own, when your Medicare Advantage plan is leaving your area, or in other specific circumstances defined by federal and state law.
Selecting a Medigap plan requires balancing your healthcare needs, budget, and personal preferences. Consider these factors:
Remember that you can't be turned down or charged more during your Medigap Open Enrollment Period, so it's wise to enroll during this protected time. Outside this window, insurance companies can use medical underwriting, potentially denying coverage or charging higher premiums based on your health history.
Navigating Medicare Supplement options doesn't have to be overwhelming. Every New Jersey resident's situation is unique, and the right plan for your neighbor might not be the best fit for you. The licensed advisors at New Jersey Medicare Advisory can help you compare plans, understand your guaranteed issue rights, and find coverage that matches your needs and budget.
Ready to explore your Medigap options? Call us today at 856-221-7051 for a free, no-obligation consultation. We're here to help you make confident, informed decisions about your Medicare coverage.