New Jersey Medicare AdvisoryBy New Jersey Medicare Advisory • April 27, 2026
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—also called Medigap—comes in. These policies, 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. You can visit any doctor or hospital in the United States that accepts Medicare—there are no network restrictions with Medigap plans.
It's important to note that Medigap policies only work with Original Medicare. If you're enrolled in a Medicare Advantage plan (Part C), you cannot use a Medigap policy. You'll need to be enrolled in both Medicare Part A and Part B to purchase a Medicare Supplement plan.
Medicare Supplement plans are standardized by the federal government 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, Plan G from one company offers the exact same coverage as Plan G from another company—only the premium and customer service may differ.
Here's what you should know about the most popular plans:
Plan G has become the most comprehensive option for 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.
Plans K and L provide partial coverage of Medicare cost-sharing and feature 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 offers much lower monthly premiums.
Note that Plans C and F are no longer available to those who became eligible for Medicare on or after January 1, 2020, though current enrollees can keep these plans.
Medigap premiums vary based on several factors, including which plan letter you choose, where you live in New Jersey, your age, whether you use tobacco, and which insurance company you select. Some companies use community-rated pricing (everyone pays the same regardless of age), while others use issue-age or attained-age rating methods.
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 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.
Selecting the right Medicare Supplement plan depends on your individual circumstances. Consider these factors:
Remember, you're not locked into your first choice forever. You can switch Medigap plans, though you may need to answer health questions unless you have guaranteed issue rights.
Choosing the right Medicare Supplement plan is an important decision that affects both your healthcare and your finances. Every person'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 at no cost to you. We'll compare plans from multiple insurance companies, explain the differences in plain language, and help you find coverage that fits your needs and budget.
Call us today at 856-221-7051 to schedule your free consultation. Let's work together to find the Medicare Supplement plan that gives you confidence and peace of mind.