New Jersey Medicare AdvisoryBy New Jersey Medicare Advisory • May 29, 2026
If you're enrolled in Original Medicare (Parts A and B), you've likely 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.
Medigap policies are sold by private insurance companies and work alongside your Original Medicare coverage. When you receive healthcare services, Original Medicare pays its share first, then your Medigap policy pays its share according to your plan's benefits. This coordination means you'll typically have fewer out-of-pocket expenses at the doctor's office or hospital.
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 you'll need to enroll in a separate Medicare Part D plan if you want medication coverage.
One of the most helpful aspects of Medigap is that plans are standardized by the federal government. Each plan letter (A, B, C, D, F, G, K, L, M, N) offers the same basic benefits regardless of which insurance company sells it. This standardization makes it easier to compare plans and prices.
Here's what you need to know about the most common plans:
Plan G has become one of the most popular options because it offers comprehensive coverage, paying for most out-of-pocket costs except the Medicare Part B deductible.
Plan N typically has lower monthly premiums but requires small copayments for some doctor visits and emergency room visits that don't result in admission.
Plans K and L offer lower premiums in exchange for covering only a percentage of your costs 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.
Plans C and F are also closed to new Medicare beneficiaries as of 2020, though those already enrolled can keep their coverage.
Medigap premiums vary based on several factors, including which plan letter you choose, where you live in New Jersey, your age, and which insurance company you select. Since the benefits are standardized, comparing prices between insurance companies is crucial—you want to find the best rate for the same coverage.
Insurance companies use different pricing methods. Some base premiums on your age and increase them as you get older, while others use community-rated pricing that's the same regardless of age. Understanding these pricing structures can help you anticipate future costs.
Remember that in addition to your Medigap premium, you'll continue paying your Medicare Part B premium. If you need prescription drug coverage, you'll also pay a separate Part D premium.
Timing matters significantly with Medigap. Your best opportunity to enroll is during your Medigap Open Enrollment Period, which lasts for six months starting the month 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 you more due to pre-existing health conditions.
Outside of this window, you may face medical underwriting, where insurance companies can review your health history and potentially deny coverage or charge higher premiums. However, certain circumstances provide guaranteed issue rights at other times, such as when you lose employer coverage or if your Medicare Advantage plan leaves your area.
Choosing the right Medigap plan involves balancing monthly premiums with potential out-of-pocket costs, considering your health needs, budget, and preferred doctors. Some people prefer the comprehensive coverage and predictability of Plan G, while others opt for Plan N's lower premiums if they don't mind occasional copayments.
The best choice is personal and depends on your individual circumstances. Working with a knowledgeable Medicare advisor can help you understand your options and find a plan that fits your specific situation.
Ready to explore your Medigap options? The licensed advisors at New Jersey Medicare Advisory are here to help you navigate your choices at no cost to you. Call us today at 856-221-7051 to discuss which Medicare Supplement plan might be right for your needs.