New Jersey Medicare AdvisoryBy New Jersey Medicare Advisory • May 22, 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, also known as 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 but are standardized by federal and state law. When you have a Medigap policy, Original Medicare pays its share of the approved amount for covered healthcare services first. Then, your Medigap policy pays its share according to your plan's benefits.
It's important to understand that Medigap only works with Original Medicare—it doesn't work 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 Part D plan if you want drug coverage.
Medigap policies are guaranteed renewable, meaning the insurance company can't cancel your policy as long as you pay your premiums, even if you develop health problems.
In most states, including New Jersey, Medigap policies are standardized and identified by letters: A, B, C, D, F, G, K, L, M, and N. Each letter represents a different set of benefits, and the benefits are the same regardless of which insurance company sells the policy. This standardization makes it easier to compare plans—you're simply comparing prices and customer service, not benefits.
Plans F and C were the most comprehensive options but are no longer available to people who became eligible for Medicare on or after January 1, 2020. However, if you were eligible before that date, you may still be able to purchase these plans.
Plan G has become one of the most popular choices because it offers comprehensive coverage similar to Plan F, covering everything except the Part B deductible.
Plan N is another popular option that provides solid coverage at a lower premium, though you'll pay small copayments for 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 between the high-coverage and cost-sharing options.
Medigap premiums vary based on several factors, including which plan letter you choose, which insurance company you select, where you live, and how the company prices its policies. Insurance companies may use one of three pricing methods:
Community-rated (no-age-rated): Everyone pays the same premium regardless of age.
Issue-age-rated: Your premium is based on your age when you buy the policy and typically doesn't increase due to age.
Attained-age-rated: Your premium is based on your current age and typically increases as you get older.
While lower premiums may seem attractive, it's essential to consider the total out-of-pocket costs, including what you'll pay when you actually use healthcare services. A plan with a slightly higher premium might save you money overall if it provides better coverage for your healthcare needs.
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.
There are other specific situations when you have guaranteed issue rights, such as when you're leaving a Medicare Advantage plan or losing employer coverage.
When choosing a Medigap plan, consider your health status, budget, doctors you see, and how much financial predictability you want. Some people prefer the peace of mind that comes with more comprehensive coverage, while others are comfortable with plans that require more cost-sharing in exchange for lower premiums.
Navigating Medicare Supplement options can feel overwhelming, but you don't have to do it alone. The licensed advisors at New Jersey Medicare Advisory understand the unique needs of New Jersey residents and can help you compare plans from multiple insurance companies at no cost to you. Call us today at 856-221-7051 to discuss which Medigap plan best fits your healthcare needs and budget.