Medicare Advantage
Medicare Annual Enrollment Period: What You Can Do by December 7
WATERTOWN, S.D. — If you looked at your Medicare mail this fall, picked a Medicare Advantage plan, and now feel unsure about the choice, you are not stuck. From January 1 through March 31, the Medicare Annual Enrollment in Watertown, SD 2027 Period gives you a second chance to adjust — and the deadline matters, because once March 31 passes, most people cannot switch again until next fall.
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Key takeaways
- The Medicare Annual Enrollment in Watertown, SD 2027 Period runs from January 1 through March 31, giving people already in a Medicare Advantage plan on January 1 one chance to make a change.
- Any switch made during this window starts on the first day of the next month, so a change in February usually takes effect March 1.
- This period only allows one change and does not let people do everything the fall Annual Enrollment Period allows, so it's worth checking your plan's Evidence of Coverage and Annual Notice of Change letter first.
- Free, unbiased help is available through 1-800-MEDICARE, Medicare.gov's Plan Finder, or South Dakota's SHIINE program (the state's SHIP) for anyone weighing a switch.
Watertown seniors get a second window to fix a Medicare Advantage choice
This period is narrower than the Annual Enrollment Period that ended December 7. It only applies to people who are already in a Medicare Advantage plan on January 1. Here is what Watertown-area residents can — and cannot — do during this window.
What you can change between January 1 and March 31
According to CMS, if you are enrolled in a Medicare Advantage plan on January 1, you may make one change during the Open Enrollment Period. Your options are:
- Switch to a different Medicare Advantage plan (with or without drug coverage).
- Drop your Medicare Advantage plan and return to Original Medicare (Parts A and B).
- If you go back to Original Medicare, add a stand-alone Part D drug plan.
The change takes effect the first day of the month after the plan receives your request. So a switch made in February typically starts March 1.
What you cannot do in this window
This is where a lot of readers get tripped up. During the January–March window, you cannot:
- Join a Medicare Advantage plan if you currently have Original Medicare. (That move had to happen during the fall Annual Enrollment Period, October 15 – December 7.)
- Switch from one stand-alone Part D drug plan to another if you are staying on Original Medicare.
- Make more than one change. Once you use your switch, that's it until the next AEP — unless you qualify for a Special Enrollment Period (for example, if you move out of your plan's service area).
Why Watertown residents might use this window
Watertown is in Codington County, where a range of Medicare Advantage plans are offered by several carriers. That means there is real room to change direction if something is not working. Common reasons people use the Open Enrollment Period include:
- Your doctor or preferred clinic in the Watertown area turned out to be out of network.
- A medication you take is not on the plan's formulary, or requires a step you did not expect.
- You realized you would rather have Original Medicare plus a stand-alone drug plan for more provider flexibility.
- Your plan's rules around referrals, prior authorization, or travel coverage do not fit your life.
Before making a change, it is worth pulling out your plan's Evidence of Coverage and the "Annual Notice of Change" letter you received this fall. Those documents spell out how the plan will work in 2027.
Program facts worth knowing before you switch
Whatever you choose, some rules apply across the whole Medicare program:
- Part D out-of-pocket cap: $2,100 in 2026 and $2,400 in 2027. Once your covered drug spending reaches that amount, you pay nothing more for covered Part D drugs the rest of the year.
- Part D maximum deductible: $615 in 2026 and $700 in 2027 (plans can set a lower deductible; this is the ceiling).
- The coverage gap — the old "donut hole" — is gone. Part D now has three phases: deductible, initial coverage, and catastrophic.
- Medicare Prescription Payment Plan. This is an optional program that lets you spread your drug costs out in monthly payments instead of paying big amounts at the pharmacy counter. It does not lower the total, but it can smooth the timing.
- IRMAA — higher-income surcharges on Part B and Part D — start above $109,000 in income for a single filer in 2026.
Understanding these numbers can make it easier to compare plans on Medicare.gov's Plan Finder without getting lost in the marketing.
How to make the change
There are three straightforward ways to switch:
1. Call 1-800-MEDICARE (1-800-633-4227), open 24/7. 2. Go to Medicare.gov, log in to your account, and use the Plan Finder to compare and enroll. 3. Call South Dakota's SHIINE program — the state's SHIP (State Health Insurance Assistance Program). SHIINE counselors offer free, unbiased, one-on-one help to South Dakotans, including folks in the Watertown area.
If you already know which plan you want, you can also enroll directly through that plan.
By the numbers
Medicare Part B premium, 2006–2026
The standard monthly Part B premium has climbed from $88.50 in 2006 to $202.90 in 2026. Hover any point for that year’s premium.
Source: CMS. Standard premium shown; in some hold-harmless years many existing enrollees paid less. Confirm at Medicare.gov.
By the numbers
How people get Medicare in Codington County
(MA penetration in Codington County)
MA penetration from CMS enrollment data; Medigap share is an estimate. U.S. average is about 54% Medicare Advantage. These are area-level figures, not plan-specific.
Key dates
Medicare enrollment periods at a glance
- Around your 65thInitial Enrollment PeriodA 7-month window around the month you turn 65 — your first chance to sign up.
- October 15 – December 7Annual Enrollment PeriodAnyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan.
- January 1 – March 31Medicare Annual Enrollment in Watertown, SD 2027If you're already in a Medicare Advantage plan, you can make one change.
- January 1 – March 31General Enrollment PeriodFor people who missed their first chance to sign up for Part B.
- VariesSpecial Enrollment PeriodTriggered by life events like moving or losing other coverage.
Dates are set by Medicare and apply nationwide. Confirm your personal windows at Medicare.gov or 1-800-MEDICARE.
Explore
When can you enroll? An interactive year
Enrollment windows are federal and the same nationwide. Confirm your personal dates at Medicare.gov or 1-800-MEDICARE.
Explore
The parts of Medicare
Good to know
Frequently asked questions
Q: I have Original Medicare. Can I use this window to join a Medicare Advantage plan?
Q: If I go back to Original Medicare, will I be able to buy a Medigap policy?
Q: When does my new plan actually start?
- CMS — Medicare enrollment periods (medicare.gov)
For personalized answers, contact Medicare.gov, 1-800-MEDICARE, or your local SHIP.