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Medicare Advantage

Medicare Advantage Open Enrollment in Greenwood, SC

GREENWOOD, S.C. — If you signed up for a Medicare Advantage plan last fall and now wish you had picked something different, you are not stuck. From January 1 through March 31, Medicare gives Advantage members a second look — a stretch called the Medicare Advantage Open Enrollment Period. It is short, it is specific, and it only comes around once a year.

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Senior using laptop at table in Greenwood — illustrating this Medicare guide
Photo: Linh Pham Photo by Linh Pham on Unsplash

Key takeaways

  • The Medicare Advantage Open Enrollment Period runs from January 1 through March 31 each year, giving people already on a Medicare Advantage plan a chance to switch plans or go back to Original Medicare.
  • This window only works for people enrolled in a Medicare Advantage plan on January 1, and any change takes effect the first day of the month after the request is received.
  • It is not a general do-over, so people on Original Medicare who missed the fall Annual Enrollment Period (October 15 – December 7) usually have to wait until October 15 unless they qualify for a Special Enrollment Period.
  • Before switching, it helps to check the drug formulary and provider network, and free unbiased help is available through the State Health Insurance Assistance Program, called SC SHIINE in South Carolina.

Here is what Greenwood residents can and cannot do during this window, and where to get help from someone who does not sell plans.

What the January–March window actually is

The Medicare Advantage Open Enrollment Period, sometimes shortened to MA-OEP, runs each year from January 1 to March 31. It is separate from the fall Annual Enrollment Period (October 15 – December 7), which is when most people make their choices for the coming year.

The rules for MA-OEP are narrower than the fall window. It exists so people who are already enrolled in a Medicare Advantage plan on January 1 have a chance to correct course if the plan is not the right fit.

What you can change between January 1 and March 31

If you are enrolled in a Medicare Advantage plan on January 1, you can use this window to do one of the following:

Any change you make takes effect the first day of the month after the plan gets your request.

What you cannot do during this window

MA-OEP is not a general do-over. According to CMS guidance on Medicare enrollment periods, during January 1 – March 31 you cannot:

If you missed the fall Annual Enrollment Period and you are on Original Medicare, this window generally will not help you. You would usually need to wait until October 15 to make a fresh choice, unless you qualify for a Special Enrollment Period for reasons like moving or losing other coverage.

Why people in Greenwood use this window

Greenwood is in Greenwood County, where a range of Medicare Advantage plans is offered by several carriers. With that many options, it is common for someone to pick a plan in the fall and then, in January or February, discover something that does not work — a favorite doctor is not in the network, a prescription is handled differently than expected, or a specialist requires a referral they did not anticipate.

The MA-OEP exists for exactly that kind of situation. It is a chance to fix a mismatch, not a second shopping spree.

2026 and 2027 numbers worth knowing before you switch

Before you change plans, it helps to know the ground rules that apply to everyone on Medicare drug coverage. A few key figures are set at the federal level and apply nationwide:

These figures come from CMS and apply nationwide — they are not tied to any particular plan.

How to make a switch you will not regret

A few steps that tend to save people headaches:

1. Check the drug list. Every Medicare Advantage plan with drug coverage has a formulary. Confirm each of your prescriptions is on it and see what tier it falls into. 2. Check the provider network. Call your doctors' offices directly and ask if they take the plan you are considering. Networks change during the year. 3. Consider the whole picture, not just the premium. Copays, referral rules, and how the plan handles specialists all matter. 4. Use unbiased help. In South Carolina, the State Health Insurance Assistance Program (SHIP) is called SC SHIINE. Their counselors do not sell insurance and their help is free.

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.

$0$50$100$150$200200820122016202020242026

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 Greenwood County

48% are on Medicare Advantage
(MA penetration in Greenwood County)
48%
52%
Medicare Advantage Medicare Supplement (Medigap) Original Medicare only
U.S. average

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 Advantage Open EnrollmentIf 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.

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Medicare Advantage companies in Greenwood County

By local enrollment size · informational, not a ranking
CompanyLocal enrollmentPlans offeredLocal agentsAction
HumanaNational—Yes
Devoted Health IncRegional—Yes
UnitedHealthcareNational—Yes
Centene (WellCare)National—Yes
Aetna (CVS Health)National—Yes
Independence Health Group IncRegional—Yes
Enrollment data: CMS Medicare Advantage enrollment by company (county level). Figures shown are illustrative sample data pending the current CMS file. Listed by enrollment size, largest first — this is not a ranking, recommendation, or endorsement of any company or plan.

Provided by licensed insurance partners; MyMedicarePlans.org may be compensated. Not a ranking or endorsement of any plan.

Explore

When can you enroll? An interactive year

JFMAMJJASOND
October 15 – December 7 — anyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan. Changes take effect January 1.

Enrollment windows are federal and the same nationwide. Confirm your personal dates at Medicare.gov or 1-800-MEDICARE.

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The parts of Medicare

Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care. Most people pay no premium for Part A.

Good to know

Frequently asked questions

Can I use January to March to join Medicare Advantage for the first time?
Generally no. To use the MA-OEP, you must already be enrolled in a Medicare Advantage plan on January 1. If you are on Original Medicare, you would usually wait for the fall Annual Enrollment Period or qualify for a Special Enrollment Period.
How many changes can I make during this window?
One. If you switch plans in January and change your mind in March, you cannot switch again under MA-OEP. This is different from the fall window.
When does my new coverage start?
On the first day of the month after your new plan receives your enrollment. If you switch in February, coverage typically begins March 1.
Sources & further reading
  • CMS — Medicare enrollment periods (medicare.gov)

For personalized answers, contact Medicare.gov, 1-800-MEDICARE, or your local SHIP.

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