Medicare 2026

Structural Medicare differences for Sioux City residents

# Medicare Advantage or Medigap? Understanding the two…

SIOUX CITY, Iowa — When people in Sioux City turn 65, they usually hear about two ways to get their Medicare coverage: Original Medicare paired with a Medigap policy, or a Medicare Advantage plan. The structure of those two paths is different, but so is something people often overlook — the calendar. The window to pick one path, and the window to safely switch later, are not the same. Miss the right date, and your options can shrink in ways that are hard to undo.

Here is how the timing works, and what Woodbury County residents should keep in mind before the next deadline.

The two paths, in one paragraph

Original Medicare is the federal program — Part A (hospital) and Part B (doctor and outpatient). A Medigap policy is sold by a private insurer and helps pay some of the costs Original Medicare leaves behind. Drug coverage under this path comes from a separate Part D plan. Medicare Advantage (Part C) is different: a private plan takes the place of Original Medicare for how you get your care, usually bundles drug coverage in, and comes with its own network and rules. Both paths are legitimate. The right one depends on your health, your budget, your doctors — and, importantly, when you decide.

The deadline that matters most: your Medigap open enrollment

The single most important date on the Medigap side is personal, not seasonal. When you are 65 or older and first enrolled in Part B, you get a six-month Medigap Open Enrollment Period. During that window, insurers in Iowa must sell you any Medigap policy they offer at their standard rate, regardless of your health history.

After those six months end, that protection generally goes away. Outside the window, an insurer can ask health questions and can decline you or charge more, except in a limited set of "guaranteed issue" situations. That is why the Medigap path is easiest to step onto early, and harder to step back onto later.

The yearly windows for Medicare Advantage and Part D

For Medicare Advantage and Part D, the calendar is more familiar:

• Annual Enrollment Period (AEP): Oct. 15 – Dec. 7. You can join, switch, or drop a Medicare Advantage plan or a Part D plan. Changes take effect Jan. 1.
• Medicare Advantage Open Enrollment Period (MA-OEP): Jan. 1 – March 31. If you are already in a Medicare Advantage plan, you get one chance to switch to another Advantage plan or to drop it and go back to Original Medicare (and add a Part D plan).

MA-OEP is not a free pass to shop everything. It is specifically for people already in Advantage. And here is the catch: dropping Advantage and returning to Original Medicare during that window does not guarantee you can buy a Medigap policy. That is where the two calendars collide.

What happens if you miss a window

A few common scenarios in Woodbury County:

• You took Medicare Advantage at 65 and want to switch to Original Medicare + Medigap at 70. You can drop the Advantage plan during AEP or MA-OEP, but a Medigap insurer can medically underwrite you. Approval is not guaranteed.
• You delayed Part B because you had job coverage. When you sign up for Part B later, a new six-month Medigap Open Enrollment window opens for you at that point. This is a big deal for people still working past 65.
• You didn't enroll in a Part D plan when first eligible and had no other creditable drug coverage. A late enrollment penalty can be added to your Part D premium, and it generally stays for as long as you have Part D.
• You missed AEP entirely. Unless you qualify for a Special Enrollment Period — for example, moving out of your plan's service area or losing other coverage — you usually wait until the next AEP.

Program facts to hold in mind for 2027

A few figures apply no matter which path you choose:

• Part D out-of-pocket cap: $2,100 for 2026.
• Part D maximum deductible: $615.
• The old coverage gap ("donut hole") is gone as of 2025; Part D now has three phases.
• The Medicare Prescription Payment Plan lets you spread drug costs across the year in monthly amounts instead of paying at the pharmacy counter.
• IRMAA income-related surcharges on Part B and Part D begin above $109,000 for a single filer in 2026.

Local context for Sioux City

Sioux City sits in Woodbury County, and that is the county whose plan availability applies to residents here. The number of Medicare Advantage and Part D options available in Woodbury County changes each year, which is one more reason the fall AEP window matters — even people who like their current coverage should read their plan's Annual Notice of Change each September before Oct. 15.

For a plan-by-plan comparison based on your ZIP code, medications and doctors, the Plan Finder at medicare.gov is the neutral tool built for that job.