New Jersey Medicare AdvisoryBy New Jersey Medicare Advisory • May 31, 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 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 but are standardized by federal law. When you have both Original Medicare and a Medigap policy, Medicare pays its share of approved healthcare costs first, then your Medigap plan pays its share according to your policy. This coordination means you typically pay less out-of-pocket when you receive medical care.
It's important to understand that Medigap only works with Original Medicare—not Medicare Advantage plans. You cannot have both a Medicare Advantage plan and a Medigap policy. Medigap also doesn't include prescription drug coverage, so most people with a Supplement plan also enroll in a standalone Part D prescription drug plan.
Medigap policies are identified by letters: A, B, C, D, F, G, K, L, M, and N. Each letter represents a different standardized benefit package. This standardization means that Plan G from one insurance company offers the exact same benefits as Plan G from another company—though premiums may differ.
Plans F and C are no longer available to people who became eligible for Medicare on or after January 1, 2020, but remain an option for those who qualified earlier. Plan G has become one of the most popular choices because it offers comprehensive coverage. Plan N provides similar benefits with slightly lower premiums but requires small copayments for some doctor visits and emergency room visits.
Plans K and L offer lower premiums but require you to pay a percentage of costs until you reach an annual out-of-pocket limit. Plans A, B, D, and M offer varying levels of coverage, with different combinations of benefits. The key is finding the balance between monthly premium costs and the level of coverage that fits your healthcare needs and budget.
Medigap premiums vary based on several factors, including which plan letter you choose, which insurance company you select, and where you live in New Jersey. Insurance companies may use different pricing methods—some base premiums on your age, others use community rating where everyone pays the same regardless of age, and some use issue-age rating based on your age when you first buy the policy.
The best time to buy a Medigap policy is during your Medigap Open Enrollment Period, which lasts for six months and begins when you're 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.
You may also have guaranteed issue rights in certain special situations, such as when you're losing other coverage or when your Medicare Advantage plan is leaving your area. These protections are valuable because outside of guaranteed issue periods, insurance companies in most states can use medical underwriting, potentially denying coverage or charging higher premiums based on your health status.
Selecting the right Medigap plan involves evaluating your healthcare needs, budget, and personal preferences. Consider how often you visit doctors, whether you travel frequently, and how important predictable costs are to you. Some people prefer comprehensive coverage with higher premiums to minimize out-of-pocket expenses, while others are comfortable with more cost-sharing in exchange for lower monthly premiums.
Compare plans from multiple insurance companies, as premiums can vary significantly even though benefits are standardized. Look beyond just the current premium—ask about the company's history of rate increases and their customer service reputation. Remember that you can switch Medigap plans later, though you may need to go through medical underwriting unless you have guaranteed issue rights.
Navigating Medicare Supplement options doesn't have to be overwhelming. Every person's situation is unique, and what works well for one individual may not be the best choice for another. The licensed Medicare advisors at New Jersey Medicare Advisory are here to help you understand your options, compare plans, and find coverage that fits your needs and budget.
For personalized assistance with your Medigap questions, call us today at 856-221-7051. We'll take the time to understand your situation and guide you toward the Medicare Supplement plan that's right for you.