New Jersey Medicare AdvisoryBy New Jersey Medicare Advisory • May 25, 2026
If you're enrolled in Original Medicare (Parts A and B), you've probably noticed that it doesn't cover everything. Deductibles, copayments, and coinsurance 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 Original Medicare. When you receive healthcare services, Medicare pays its share first, and then your Medigap policy pays its share according to your plan's coverage. 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 policies only work with Original Medicare—they don't work with Medicare Advantage plans. You also cannot have both a Medigap policy and a Medicare Advantage plan at the same time. Medigap policies generally don't include prescription drug coverage, so most people also enroll in a separate Medicare Part D plan for medications.
One of the most confusing aspects of Medigap is the alphabet soup of plan letters. The good news? These plans are standardized by federal law, meaning Plan G from one company offers the same basic benefits as Plan G from another company. The main difference between companies is the monthly premium.
Here's a brief overview of the available plans:
Plans with comprehensive coverage: Plan F and Plan G offer the most complete coverage. Plan F is only available to those who became eligible for Medicare before January 1, 2020. Plan G has become the most popular choice for new Medicare beneficiaries because it covers nearly everything except the Part B deductible.
Plans with moderate coverage: Plans D, M, and N offer solid coverage at lower premiums. Plan N requires small copayments for doctor visits and emergency room visits but is often significantly less expensive than Plan G.
Plans with cost-sharing: Plans K and L require you to pay a percentage of costs, but they have out-of-pocket limits and typically feature the lowest premiums.
High-deductible options: There's also a high-deductible version of Plan G, which requires you to pay a substantial deductible before coverage begins, but comes with much lower monthly premiums.
Plans C and B are also available but less commonly chosen today.
Medigap premiums vary widely based on several factors including your age, location, tobacco use, and the insurance company you choose. In New Jersey, insurance companies typically use one of three pricing methods: community-rated, issue-age-rated, or attained-age-rated. Understanding which method a company uses can help you predict how your premiums might change over time.
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 may also have guaranteed issue rights in certain special situations, such as when you're losing other coverage or if your Medicare Advantage plan is leaving your area. These rights are valuable and time-sensitive, so it's important to understand when they apply to you.
Selecting a Medigap plan is a personal decision that depends on your healthcare needs, budget, and preferences. Consider these factors:
Remember, you can generally switch Medigap plans at any time, but outside of your guaranteed issue periods, you may need to go through medical underwriting.
Navigating Medicare Supplement options doesn't have to be overwhelming. The team at New Jersey Medicare Advisory is here to help you compare plans, understand your costs, and find coverage that fits your unique situation. We'll walk you through your options in plain language and help you make an informed decision.
Ready to explore your Medigap options? Call us today at 856-221-7051 to speak with a licensed Medicare advisor who can provide personalized guidance at no cost to you.