Medicare Supplement

Medigap in Sun Prairie: the one enrollment window insurers cannot turn down

Sun Prairie, Wis. — If you are approaching 65 in Sun Prairie, there is one Medicare decision that works on a clock most people never hear about until it is almost gone. It is the Medigap Open Enrollment Period, and it is the only stretch of time when any Medigap insurer selling in Wisconsin has to accept you, at the standard price, no matter what your health history looks like.

Miss it, and the rules change in ways that can quietly narrow your choices for the rest of your life.

What Medigap actually does

Medigap, also called Medicare Supplement Insurance, is a policy you buy from a private insurer to help pay some of what Original Medicare (Parts A and B) leaves behind — things like coinsurance and hospital costs. It only works alongside Original Medicare, not with a Medicare Advantage plan.

Wisconsin is one of three states (with Massachusetts and Minnesota) that standardizes Medigap differently from the rest of the country. The core idea is the same, though: a Medigap policy fills gaps in Original Medicare, and the same benefits are the same benefits no matter which insurer sells them.

The six-month window, explained

Your Medigap Open Enrollment Period begins the first day of the month you are both 65 or older and enrolled in Medicare Part B. It runs for six months. That is it — one time, one window.

Inside that window, you have what CMS calls a "guaranteed issue" right. That means:

• Any Medigap insurer selling in Wisconsin must sell you any policy they offer.
• They cannot refuse you because of a pre-existing condition.
• They cannot charge you a higher premium because of your health.

This is the only period in federal law that gives every new enrollee that protection automatically. It is why Medicare counselors talk about it so often — the decision you make (or delay) here can follow you for decades.

What changes after it closes

Once the six months are up, Medigap goes back to being medically underwritten in most cases. An insurer can:

• Ask detailed health questions.
• Turn you down.
• Charge you more based on your health.
• Make you wait before covering a pre-existing condition.

There are a few narrow "guaranteed issue" situations later in life — for example, if certain employer coverage ends, or if you tried Medicare Advantage for the first time and want to switch back within 12 months. But those are exceptions, not a second open window. For most people, the six-month period at 65 is the only time the door is open for anyone, in any health.

A common Sun Prairie mistake: waiting to see how it goes

A pattern local Medicare counselors see often: someone turns 65, feels healthy, picks a Medicare Advantage plan (or stays on employer coverage past 65 without enrolling in Part B), and figures they will "switch to Medigap later if I need it." Later, when a diagnosis makes them want that switch, they find out an insurer can now say no.

That is not a scare tactic — it is just how the federal rule is written. Being aware of it before your Part B start date is the whole point of planning ahead.

One more wrinkle worth knowing: if you delay Part B because you have creditable employer coverage, your six-month Medigap window does not start until Part B actually begins. So the clock is tied to your Part B start date, not your 65th birthday alone.

How to use the window well

A few practical steps while the window is open:

• Confirm your Part B start date in writing so you know exactly when your six months begin and end.
• Decide whether you want Original Medicare + Medigap + a stand-alone Part D drug plan, or a Medicare Advantage plan. Medigap only pairs with Original Medicare.
• Compare Medigap policies by benefits and premium. In Wisconsin, the same base plan offers the same core benefits across insurers, so price and customer service are the main differences.
• Ask about rate stability — how the insurer has raised premiums for existing customers in past years.

Sun Prairie is in Dane County, and the Medigap policies available to you are the ones licensed to sell in Wisconsin.

Where to get unbiased help

You do not have to figure this out alone, and you do not have to talk to a salesperson to get answers.

• Medicare.gov has the official Medigap rules and a plan finder.
• 1-800-MEDICARE (1-800-633-4227) is staffed 24/7.
• Wisconsin's SHIP, known here as the Medigap Helpline (1-800-242-1060), gives free, one-on-one counseling from people who do not sell insurance.