The Top 5 Mistakes People Make When Buying a Medigap Policy

Medicare is a fantastic program that helps millions of Americans cover their healthcare costs in retirement. But if you’ve spent any time trying to understand how Medicare works, you know that it doesn’t cover everything. That’s where Medicare Supplement Insurance—also known as Medigap—comes in.

Medigap plans are designed to help pay for those “gaps” in Original Medicare coverage—things like copayments, coinsurance, and deductibles. Sounds simple, right? Unfortunately, many people get tripped up during the process of buying a Medigap policy.

And here’s the truth: Buying the wrong plan (or missing out on key benefits) can cost you thousands of dollars over time.

So let’s take the confusion out of it. Below, we’ll explore the top 5 mistakes people make when buying a Medigap policy—and how to avoid them—so you can make a decision that’s smart, clear, and right for you.

Mistake #1: Waiting Too Long to Buy

One of the most common mistakes people make with Medigap is waiting too long to buy it. Many folks don’t realize that there’s a special window where you have guaranteed access to any Medigap plan available in your area—no medical underwriting, no health questions, no chance of denial.

That window is called your Medigap Open Enrollment Period, and it’s a one-time, six-month window that begins the first month you’re both 65 or older and enrolled in Medicare Part B.

Miss that window? You might still be able to get a policy, but insurers can:

* Deny you coverage based on your health

* Charge you higher premiums

* Impose waiting periods for pre-existing conditions

Why it happens: Many people simply don’t know about the enrollment window, or they assume they can “shop around later.”

How to avoid it:

* Mark your calendar for your Medigap Open Enrollment Period.

* Even if you feel healthy today, buying a plan during this window locks in coverage for the future—even if your health changes later on.

Mistake #2: Assuming All Medigap Plans Are the Same

Here’s where things get tricky. By law, Medigap plans are standardized—meaning Plan G is Plan G, no matter which insurance company sells it. The benefits are the same.

So why does this matter? Because people assume that if the benefits are the same, the price must be the same too.

It’s not.

Insurance companies can charge wildly different premiums for the exact same coverage. Two companies in the same zip code might offer Plan G, but one might charge $120 a month, and the other might charge $180 a month.

Why it happens: People naturally trust big-name brands or local agents and don’t realize they should shop around for the best price.

How to avoid it:

* Get quotes from multiple insurance companies.

* Work with an independent broker who represents several companies—not just one.

* Don’t pay extra just for a fancy logo on the envelope. If the benefits are the same, it makes sense to choose the better price (as long as the insurer is financially stable).

Mistake #3: Overlooking the Cost of Rate Increases

Nobody likes to think about future rate hikes, but it’s a reality with Medigap policies. While the coverage itself doesn’t change, the premium you pay almost certainly will.

Some insurance companies offer tempting low introductory rates, but those rates can creep up every year. Depending on your plan, your location, and your insurer’s pricing method, you could see 5%–10% increases annually—or even more in some cases.

Why it happens: Buyers are often focused on the monthly premium today and forget to ask how the pricing will change over time.

How to avoid it:

* Ask your agent or broker about the pricing method the company uses:

   1. Community-rated (everyone pays the same regardless of age)

   2. Issue-age-rated (premium based on your age when you buy)

   3. Attained-age-rated (starts low but increases as you age)

* Look up rate increase history for the insurer you’re considering.

* Don’t fall for the lowest introductory rate unless you understand what you’ll likely be paying five or ten years down the road.

Mistake #4: Buying Too Much—or Too Little—Coverage

Medigap plans range from basic coverage (like Plan A or Plan K) to nearly comprehensive coverage (like Plan G or Plan N). Some people go for the maximum right away, thinking it’s the safest choice. Others try to save money by buying minimal coverage—only to find out later that they’re still on the hook for costly medical bills.

Why it happens: Many people don’t take the time to realistically assess their personal health risks, financial situation, or how much they’ll actually use healthcare services.

How to avoid it:

* Review your current health history and expected medical needs.

* Think about how often you visit doctors or specialists.

* Balance monthly premiums against potential out-of-pocket expenses.

* Plan G is often recommended for those who want peace of mind with very few out-of-pocket costs, while Plan N offers lower premiums in exchange for modest copays.

The key is customizing your plan to your life—not just picking what your neighbor chose.

Mistake #5: Forgetting About Prescription Drug Coverage

This one’s a sneaky mistake: Medigap plans don’t cover prescription drugs.

That’s right—while Medigap helps with hospital and medical costs, it doesn’t help you at the pharmacy counter. Many people don’t realize this until they’re hit with an unexpectedly large bill for medications.

If you want prescription drug coverage, you’ll need to purchase a separate Medicare Part D plan.

Why it happens: Medicare is already complicated enough, and people often assume that “supplemental” means “covers everything else.”

How to avoid it:

* Shop for a Part D prescription plan at the same time you buy your Medigap policy.

* Don’t skip drug coverage just because you’re healthy now. If you go more than 63 days without creditable drug coverage, you may face late enrollment penalties later.

* Use the Medicare Plan Finder or talk to a knowledgeable broker to find a Part D plan that works with your medications.

Final Thoughts: Making the Right Medigap Decision

Buying a Medigap policy doesn’t have to be confusing, but it can be costly if you make one of these common mistakes. By knowing what to watch out for—and taking your time to research your options—you can avoid overpaying, under-insuring, or missing out on critical coverage.

Here’s a quick recap:

1. Don’t miss your Open Enrollment Period.

2. Shop around for pricing, even if the coverage is standardized.

3. Ask how premiums may increase over time.

4. Choose coverage that fits your actual healthcare needs—not just what’s popular.

5. Pair your Medigap plan with a Medicare Part D prescription plan.

And remember—you don’t have to do this alone. There are professionals who specialize in Medicare planning who can help you compare options, explain the fine print, and make sure you feel confident about your choice.

After all, Medigap is about peace of mind—giving you the confidence that your healthcare costs won’t derail your retirement. Take your time, ask questions, and protect the future you’ve worked so hard for.

Need help choosing the right Medigap plan for your situation? Reach out—I’m happy to help you simplify the process and find a plan that truly fits your needs.