Medicare 2026

Medigap and Medicare Advantage in Warren: how they differ

WARREN, Mich. — For people turning 65 in and around Warren, the choice between Original Medicare paired with a Medigap policy and a Medicare Advantage plan often comes down to one thing that surprises new enrollees: the calendar. The two paths look similar on paper, but they follow very different timing rules, and missing a window on one side can quietly close a door on the other.

Two paths, two very different clocks

Original Medicare (Parts A and B) is the federal program itself. Many people pair it with a standalone Part D drug plan and a Medigap (Medicare Supplement) policy sold by a private insurer to help cover the out-of-pocket costs Original Medicare leaves behind.

Medicare Advantage (Part C) is different. It's a private plan that replaces the way you get your Part A and Part B benefits, and it usually bundles in Part D drug coverage. You still have Medicare — you just receive it through the plan.

The structural difference matters, but the timing difference is where people trip. Medigap runs on a mostly one-time personal clock. Medicare Advantage and Part D run on the public calendar every year.

The Medigap window most people only get once

When you first enroll in Part B at 65 or older, a six-month Medigap open enrollment period begins. During those six months, insurers in most states must sell you any Medigap policy they offer at their standard price, regardless of your health history.

After that window closes, in most states an insurer can use medical underwriting — meaning they can look at your health and either charge you more or turn you down — if you try to buy or switch a Medigap policy later. A handful of states have their own extra protections; Michigan largely follows the federal rules.

This is why the Medigap decision at 65 feels heavier than it looks. If you choose Medicare Advantage at 65 and want to switch to Original Medicare with Medigap five years from now, you may face underwriting to get that supplement policy.

The public windows that repeat every year

Medicare Advantage and Part D drug plans use two annual windows, according to Medicare basics at medicare.gov:

• Annual Enrollment Period (Oct. 15 – Dec. 7): You can join, switch, or drop a Medicare Advantage plan, or change your Part D drug plan. Changes take effect January 1.
• Medicare Advantage Open Enrollment Period (Jan. 1 – March 31): If you're already in a Medicare Advantage plan, you can switch to a different Advantage plan once, or drop it and go back to Original Medicare (and add a standalone Part D plan). You can't use this window to jump from Original Medicare into an Advantage plan.

There are also Special Enrollment Periods for life events like moving, losing employer coverage, or qualifying for Extra Help.

What that means for a Warren reader in real time

Warren is in Macomb County, where Medicare beneficiaries have many Medicare Advantage and Part D options to sort through each fall. Whichever path you pick, plan on reviewing your coverage every year during the October 15 – December 7 window — drug lists, provider networks, and costs change annually, even if you're happy with what you have.

A few timing scenarios worth thinking through:

• Turning 65 soon. Your Medigap six-month clock starts when you're both 65 and enrolled in Part B. If you're leaning toward Original Medicare + Medigap, that window is the easiest time to lock it in.
• Already in a Medicare Advantage plan and unsure. You have two shots to make a change each year: the fall Annual Enrollment Period and the January 1 – March 31 Advantage Open Enrollment. But switching back to Original Medicare and picking up a Medigap policy later may involve underwriting.
• Still working past 65 with employer coverage. You may qualify for a Special Enrollment Period when that coverage ends. Get the timing right — a late Part B enrollment can trigger a lifelong premium penalty and delay your Medigap window.

What's the same on both paths in 2027

No matter which path you choose, Part D rules apply to your drug coverage — either built into your Advantage plan or through a standalone plan alongside Original Medicare. The Part D out-of-pocket cap is $2,100 in 2026 and $2,400 in 2027, and the maximum deductible is $615 in 2026 and $700 in 2027. The old coverage gap ("donut hole") is gone as of 2025, replaced by a simpler three-phase structure. The optional Medicare Prescription Payment Plan lets you spread your drug costs across the year in monthly amounts instead of paying all at once at the pharmacy counter.

Higher-income enrollees should also plan around IRMAA, the income-related surcharge that begins above $109,000 for a single filer in 2026 and affects both Part B and Part D premiums.