A Guide To Medicare Supplement Insurance (Medigap) Plans

If you’re new to Medicare, you’ve probably discovered that Original Medicare (Parts A and B) doesn’t cover everything. That’s where Medicare Supplement Insurance—also known as Medigap—can help. These optional policies are designed to make your out-of-pocket costs more predictable and your healthcare planning less stressful.

This guide explains what Medigap is, how it works with Medicare, and how to decide if it’s right for you during the Medicare Annual Enrollment Period.

What Is Medicare Supplement Insurance?

Medicare Supplement Insurance (Medigap) plans are private policies that help pay the costs Original Medicare doesn’t—like deductibles, copays, and coinsurance.

Think of Medigap as a financial safety net that fills the “gaps” left by Medicare Parts A and B. You’ll still have Medicare as your primary coverage, but your Medigap plan helps with what’s left over after Medicare pays its share.

Here’s what’s important to know:

You must have both Medicare Part A (hospital insurance) and Part B (medical insurance) to buy a Medigap plan.
Medigap plans only cover one person—spouses need their own policies.
Plans are standardized, which means each lettered plan (A through N) offers the same benefits no matter which insurance company sells it.

Monthly premiums and pricing structures vary by location and provider.

Why People Choose Medigap

For many, Medigap offers peace of mind. Original Medicare (Part A and Part B) doesn’t have a cap on out-of-pocket costs, so a single illness or hospital stay can lead to big bills.

A Medigap plan helps cover expenses like:

The Part A hospital deductible.
The 20% coinsurance for outpatient care under Part B.
Certain copayments for skilled nursing care or hospice.
In some cases, limited coverage for emergency care while traveling abroad.

Medigap doesn’t cover routine dental or vision care, hearing aids or prescription drugs. To get medication coverage, you’ll need to enroll in a separate Medicare Part D plan.

When and How to Enroll

You’re first eligible to enroll in a Medigap plan when you’re both 65 or older and enrolled in Medicare Part B.

During the first six months after your Part B coverage starts, you have a Medigap Open Enrollment Period. During this window:

You can buy any Medigap plan available in your area.
Insurance companies can’t deny you coverage or charge more because of preexisting conditions.

If you apply after this period, insurers can use medical underwriting to decide whether to approve your application or what premium to charge. That’s why enrolling early is so important.

What Medigap Plans Cover

There are ten standardized Medigap plans available in most states (Plans A, B, C, D, F, G, K, L, M and N). Each plan offers a different mix of benefits.

Some highlights:

Plan G is now one of the most popular options—it covers nearly all Medicare-approved costs except the Part B deductible.
Plan N offers slightly lower premiums but includes small copays for doctor and emergency visits.
Plan F, which covers all Medicare-approved expenses, is no longer available to people who became eligible for Medicare after January 1, 2020.

Premiums vary widely. For example, a high-deductible Plan F in some areas might cost around $30 per month, while a standard Plan F or G could exceed $300 depending on where you live.

How Medigap Differs From Medicare Advantage

It’s easy to confuse Medigap with Medicare Advantage (Part C), but they’re very different:

Feature	Medigap	Medicare Advantage
Works with Original Medicare	Yes	No (replaces Original Medicare)
Provider Network	Any doctor who accepts Medicare	Usually limited to network providers
Prescription Coverage	Requires a separate Part D plan	Often included
Out-of-Pocket Limits	No official limit (but covers most costs)	Annual spending limit set by plan
Plan Type	Supplemental insurance	All-in-one alternative plan

If you prefer nationwide access to doctors who accept Medicare and don’t want to deal with network restrictions, a Medigap policy might fit better. If you’d rather combine your coverage into one plan with added benefits like dental or vision, consider a Medicare Advantage plan.

Tips for Comparing Plans

Choosing a Medigap plan is a personal decision that depends on your health, finances, and comfort level with risk. Here’s how to make an informed choice:

Compare premiums and coverage: Look at what each plan pays for and how much you’ll owe monthly.
Check rate trends: Ask insurers how often and by how much premiums typically increase.
Review your health outlook: If you expect frequent care or have ongoing conditions, a more comprehensive plan may save money long term.

Don’t forget Part D: Add a standalone prescription plan if you take regular medications.

Moving Forward With Confidence

Navigating Medicare can be overwhelming at first, but taking it step by step helps. Start by understanding your current health needs and what you can afford monthly. Then, compare plan options in your area or speak with a licensed Medicare advisor.

The right Medicare Supplement Insurance plan can bring peace of mind—knowing you’re protected from unexpected medical costs and free to focus on what really matters: your health.

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