When to Enroll in a Medicare Supplement Insurance (Medigap) Plan

Medicare can feel complicated when you first join. Original Medicare (Parts A and B) helps pay for hospital and medical care, but it doesn’t cover everything. Many people choose to add a Medicare Supplement Insurance plan, also known as Medigap, to help manage out-of-pocket costs.

The key is knowing when you can enroll in a Medigap plan. Timing matters because your options and prices can change depending on when you apply.

What a Medicare Supplement Insurance (Medigap) Plan Does

A Medicare Supplement Insurance plan is private insurance that works alongside Original Medicare. After Medicare pays its share of your medical bills, Medigap helps cover what’s left, such as:

• Deductibles
• Coinsurance
• Copayments

Some Medigap plans may also pay for emergency care while traveling abroad.

You’ll still pay your Medicare Part B premium, plus a separate premium for your Medigap plan. These policies cover only one person, so if you’re married, each of you needs your own policy.

All Medigap plans of the same letter (A through N) provide the same benefits, no matter which company you buy from. The only difference is the cost.

When You First Qualify for Medicare

Most people become eligible for Medicare at 65. When you first sign up for Medicare Part A (hospital insurance) and Part B (medical insurance), you’ll be covered under Original Medicare.

At that point, you can decide whether to add Medigap. If you want prescription coverage, you’ll also need to purchase a Part D plan, since Medigap doesn’t include drug benefits.

It’s important not to confuse Medigap enrollment with the Medicare Annual Enrollment Period (AEP) that happens each fall from October 15 to December 7. The fall AEP allows you to make changes to Medicare Advantage or Part D plans. Medigap has its own separate enrollment window.

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Your Medigap Open Enrollment Period

The best time to buy a Medigap policy is during your Medigap Open Enrollment Period (OEP).

This six-month window starts when you are both:

1. 65 or older, and
2. Enrolled in Medicare Part B.

During this time:

• You can buy any Medigap plan sold in your state.
• You cannot be denied coverage because of preexisting conditions.
• You’ll get the best available rates.

Your Medigap OEP only happens once, so it’s important not to miss it. For example, if you enroll in Part B on July 1, your Medigap OEP ends on December 31. After that, your options may become limited.

Some states, such as Connecticut, Massachusetts, Maine, and New York, have special rules that allow you to enroll or switch Medigap plans at certain times of the year or year-round.

If You Miss Your Medigap Open Enrollment Period

You can still apply for a Medigap plan after your OEP ends, but insurance companies may:

• Require you to answer health questions
• Charge higher premiums based on your health
• Deny your application entirely

The exception is if you qualify for guaranteed issue rights. These rights protect you from being denied a Medigap plan or charged more due to your health in certain situations.

Guaranteed Issue Rights Explained

You may qualify for guaranteed issue rights if your current coverage changes or ends. Common situations include:

• You have group or COBRA coverage that ends.
• Your Medicare Advantage plan stops offering coverage in your area or you move out of its service area.
• You joined a Medicare Advantage plan when you first became eligible for Medicare at 65, and you decided to switch back to Original Medicare within the first year.
• You left a Medigap policy to try Medicare Advantage for the first time and now want to return to Medigap within the first year.

When you have guaranteed issue rights, you generally have 63 days from the date your other coverage ends to apply for a Medigap plan.

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Working Past 65 and Delaying Medicare

If you’re still working and covered by an employer or union plan when you turn 65, you may be able to delay Medicare Part B.

When that job-based coverage ends and you sign up for Part B, your Medigap Open Enrollment Period begins at that time. You’ll then have six months to buy any plan sold in your state without medical questions or higher rates.

If You’re Under 65

Some states allow people under 65 who qualify for Medicare due to disability to buy a Medigap policy. However, these plans often cost more. When you reach 65, you’ll get a new six-month open enrollment window to buy a plan at the best rate.

If You Can’t Get a Medigap Plan

If you don’t qualify for Medigap or your application is denied, you’ll need to pay your Medicare out-of-pocket costs yourself. Original Medicare does not have a maximum spending limit, so expenses can add up quickly.

Here’s an example:

If Medigap isn’t available, consider a Medicare Advantage plan. These plans bundle Parts A and B and often include prescription coverage. They have an annual out-of-pocket limit, which can help protect you from high costs.

Medigap Plans at a Glance

There are 10 standardized Medigap plans labeled A through N. Each covers a different share of Medicare’s out-of-pocket costs.

Here’s a general overview:

• Plan F: Covers all gaps, but only available if you were eligible for Medicare before January 1, 2020.
• Plan G: Offers nearly identical coverage to Plan F, except you pay the Part B deductible.
• Plan N: Covers most costs but includes small copayments for some doctor and emergency room visits.

All plans provide nationwide coverage at any provider that accepts Medicare.

Tips for Choosing a Medigap Policy

• Compare quotes from several insurance companies.
• Look at each plan’s lettered benefits and decide which matches your health needs.
• Consider how much you can afford in monthly premiums versus out-of-pocket expenses.
• Remember that Medigap policies are guaranteed renewable as long as you pay your premiums on time.

Takeaway

Your Medigap Open Enrollment Period is your best opportunity to buy a Medicare Supplement Insurance plan at the lowest price and without health restrictions.

If you wait too long, you may face higher costs or limited options. Review your coverage needs, understand your enrollment timeline, and compare plans before your window closes.

If you’re unsure where to start, contact a State Health Insurance Assistance Program (SHIP) counselor or a licensed Medicare agent for free, personalized help.

The right Medigap plan can give you confidence, control, and financial protection throughout your Medicare journey.

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