Which Medicare window are you in right now?
Start from what you want to do, not from the calendar. Medicare’s windows are tied to an action: signing up for the first time, switching plans, fixing a missed sign-up, or reacting to a life event. The same date can be open for one action and closed for another, which is why “Is open enrollment open?” produces confusing answers on the phone.
| You want to | Window | Dates | When the change starts |
|---|---|---|---|
| Sign up for Part A and Part B the first time at 65 | Initial Enrollment Period | 3 months before your birthday month, that month, 3 months after | The month you turn 65 if you sign up before it; otherwise the month after you sign up |
| Switch Advantage plans, move between Original Medicare and Advantage, or join, drop or switch a drug plan | Open Enrollment (fall) | October 15 to December 7, 2026 | January 1, 2027 |
| Leave or switch an Advantage plan you are already in | Medicare Advantage Open Enrollment | January 1 to March 31, 2027, or your first 3 months with Medicare | The first of the month after the plan gets your request |
| Sign up for Part B after missing your first window | General Enrollment Period | January 1 to March 31 every year | The first of the month after you sign up |
| React to a move, lost coverage, Medicaid, EPIC or a plan ending | Special enrollment period | Depends on the event | Depends on the event |
The Initial Enrollment Period: your first seven months
The Initial Enrollment Period lasts seven months: it starts three months before the month you turn 65 and ends three months after it. Medicare.gov sets the start date by the month you act. Sign up in the three months before your birthday month and Part B begins the month you turn 65. Sign up in the birthday month or in any of the three months after, and coverage begins the following month, so every month of delay is a month without Part B.
People already receiving Social Security or Railroad Retirement benefits are enrolled automatically: the Medicare & You 2027 handbook says Part A and Part B start the first day of the month you turn 65, and the card arrives about three months before the birthday. Everyone else has to sign up.
The same seven months are also your first chance to join a Medicare Advantage plan (you need both Part A and Part B) or a drug plan (Part A or Part B is enough). If you are still working, the rules for delaying Part B depend on the size of the employer. Turning 65 in New York walks through that decision.
The fall window: October 15 to December 7, 2026
This is the window advertised on television, and it is narrower than the ads suggest. Medicare.gov lists what it allows: join, drop or switch a Medicare Advantage plan, with or without drug coverage; move between Original Medicare and Advantage; and, if you are in Original Medicare, join, drop or switch a stand-alone drug plan. The plan must receive your request by December 7, and the change takes effect January 1, 2027.
The choice in New York is wide. CMS’s state fact sheet counts 227 Medicare Advantage plans for 2027 (218 in 2026), an average Advantage premium of $30.79 a month, and 9 stand-alone drug plans, the cheapest at $37.30 a month. Plan Finder on Medicare.gov has carried the 2027 plans since October 1, 2026.
You do not have to re-enroll to keep your coverage: plans renew automatically with next year’s terms. That makes the annual notice of change the deciding document. How to read it · Advantage or Original Medicare.
January to March: two windows that are easy to confuse
Two separate windows run from January 1 to March 31, and they serve different people.
Medicare Advantage Open Enrollment is only for people already in an Advantage plan. You can switch to another Advantage plan, or leave for Original Medicare and join a stand-alone drug plan. The handbook is explicit that you can make only one change, effective the first of the month after the plan gets your request, and that you cannot use this window to move from Original Medicare into Advantage or to switch stand-alone drug plans. People new to Medicare who joined an Advantage plan also get this option during their first three months with Part A and Part B. The January window in detail.
The General Enrollment Period is for people who never signed up for Part B (or premium Part A) when first eligible and have no special period. Since 2023 coverage starts the first of the month after you sign up, and a late penalty may apply. Missed Part B?.
Special enrollment periods: the events that open a door
Special enrollment periods open because something happened, not because of the date. Medicare.gov lists more than twenty; these are the ones New Yorkers use most often.
| Event | What you can do | How long the door stays open |
|---|---|---|
| You move out of your plan’s area, or to a place with new plan options | Switch Advantage or drug plan, or return to Original Medicare | From the move through 2 full months after (from the month before, if you tell the plan in advance) |
| Employer or union coverage ends, including COBRA | Join an Advantage or drug plan | 2 full months after the month coverage ends |
| Current employer coverage ends and you delayed Part B | Sign up for Part B with no penalty | 8 months after the job or the coverage ends, whichever comes first |
| You move into, live in, or leave a nursing home or rehab hospital | Join, switch or drop plans | While you live there and 2 full months after you leave |
| You lose Medicaid | Join or switch plans, or drop drug coverage | 3 full months from losing eligibility or the notice, whichever is later |
| A 5-star plan exists in your area | Switch into it, once | December 8 to November 30 of the following year |
| Your plan’s contract is not renewed | Switch plans | December 8 through the last day of February |
If none of these fits, Medicare reviews “exceptional circumstances” case by case, such as misleading information from a plan. Call 1-800-MEDICARE (1-800-633-4227) and describe exactly what happened and when.
New York’s extra doors: EPIC, Medicaid, Extra Help and the savings programs
Several special periods come from programs that New York runs or that many low-income New Yorkers hold. They are the reason a New Yorker can sometimes fix a plan problem in March or July.
EPIC. The state’s drug program for people 65 and older is a State Pharmaceutical Assistance Program. The Health Department says that gives a new member a special period to join a Part D plan at any time, and existing members one plan change per calendar year. EPIC in New York.
Medicaid or Extra Help. If you have either, Medicare.gov allows a change once a calendar month: switch drug plans, or leave an Advantage plan with drug coverage for a stand-alone drug plan, effective the first of the next month. People with full Medicaid can also join an integrated dual plan once a month. Medicare and Medicaid together.
Medicare Savings Programs. The Medicare Rights Center’s 2026 training for New York counselors states that enrolling in a savings program enrolls you in Part B in any month of the year and permanently removes the Part B late penalty. In 2026 QMB reaches $1,836 a month for one person and QI $2,474, with no asset test. The savings programs.
What missing a window costs: Part B and Part D penalties
| Penalty | Formula | How long it lasts | Ways around it |
|---|---|---|---|
| Part B | 10% of the standard premium for each full 12 months you could have had Part B and did not | For as long as you have Part B | A special period after current employer coverage; a Medicare Savings Program |
| Part D | 1% of the national base premium for each full month without creditable drug coverage, after a gap of 63 days or more in a row | Added to your premium as long as you have Medicare drug coverage, even if you switch plans | Extra Help: people who get it do not pay the penalty |
| Premium Part A (only if you must buy Part A) | Premium may rise 10% | Twice the number of years you could have had Part A | A special enrollment period |
The Part D arithmetic, with CMS’s 2027 base premium of $41.33: 14 months without coverage is a 14% penalty, $41.33 × 0.14 = $5.79, rounded to the nearest ten cents as $5.80 a month, on top of the plan premium, every month. The base premium can rise each year, so the dollar amount of the same penalty usually grows. The Part B penalty works on full years only: the handbook’s example is a person 27 months late who pays 20%, because 27 months contain two full 12-month periods.
How to use the windows without losing a month
- Write down your own dates. Your Initial Enrollment Period, the date any employer coverage ends, and the date of any move. Those three dates decide which window applies.
- Check the cheap fixes first. If your income is near the savings program lines, apply at HRA before paying a Part B penalty; if you are 65 or older, ask EPIC whether you qualify.
- In the fall, read the annual notice of change for your plan before October 15, and compare 2027 plans on Medicare.gov’s Plan Finder.
- Get any change to the plan by December 7. A request that reaches the plan on December 8 waits for a special period that you may not have.
- Keep the confirmation. It states the effective date. If a January bill does not match, the letter is your proof.
Sentence for 1-800-MEDICARE or a plan: “I want to make a change to my coverage. Which enrollment period am I using, and what is the effective date?” Free help to work out which window applies: HIICAP, New York’s Medicare counseling program, at 1-800-701-0501. Free Medicare counseling in New York City.
Questions people ask
What are the Medicare enrollment periods?
The Initial Enrollment Period around your 65th birthday, Open Enrollment from October 15 to December 7, Medicare Advantage Open Enrollment from January 1 to March 31, the General Enrollment Period for Part B from January 1 to March 31, and special enrollment periods triggered by events such as a move or lost coverage.
When is the Part D sign-up period?
You can first join a drug plan during your Initial Enrollment Period. After that, you can join or switch from October 15 to December 7 each year, or in a special enrollment period. In New York, EPIC members and people with Medicaid or Extra Help have extra chances during the year.
When can I change my Medicare Advantage plan?
From October 15 to December 7 for a January 1 start, or once between January 1 and March 31 if you are already in an Advantage plan. A move, a lost coverage, Medicaid, Extra Help or a 5-star plan can open a special period.
Is the Part D late penalty permanent?
It is added to your premium for as long as you have Medicare drug coverage, even if you change plans. It is 1% of the national base premium, $41.33 in 2027, for each full month you went without creditable coverage after a gap of 63 days. People with Extra Help do not pay it.
Can I sign up for Part B outside the General Enrollment Period in New York?
Yes, if you qualify for a Medicare Savings Program. Enrolling in one adds Part B in any month and removes the Part B late penalty. The application goes to HRA in New York City, or online through NY State of Health.
Does EPIC give me a special enrollment period?
Yes. New members can join a Part D plan at any time of the year, and existing members get one plan change per calendar year, according to the state Health Department.
Sources
- Medicare.gov, when does Medicare coverage start (Initial and General Enrollment Periods, Part B special periods) (checked 2026-11-03)
- Medicare.gov, joining a health or drug plan (Open Enrollment, Medicare Advantage Open Enrollment, first-year rules) (checked 2026-11-03)
- Medicare.gov, special enrollment periods for health and drug plans (checked 2026-11-03)
- Medicare.gov, Part D costs and the late enrollment penalty (checked 2026-11-03)
- CMS, Medicare Part D 2027 national average monthly bid amount (base beneficiary premium $41.33), July 28, 2026 (checked 2026-11-03)
- Medicare & You 2027, the official handbook (checked 2026-11-03)
- CMS, 2027 Medicare Advantage and Part D landscape, state fact sheets (New York, September 28, 2026) (checked 2026-11-03)
- NYS Department of Health, EPIC and Medicare Part D (special enrollment period) (checked 2026-11-03)
- NYS Department of Health, Medicare Savings Program 2026 (checked 2026-11-03)
- Medicare Rights Center, Medicare Savings Programs in New York, 2026 training deck (checked 2026-11-03)
More in Medicare in New York: What the Fall Season Actually Decides
- Medicare Appeals and the ABN in New York: What the Notice Means and How to Fight a Denial — An ABN (Advance Beneficiary Notice) warns that Original Medicare may not pay. Which option to check, how to appeal, the deadlines and the fast discharge appeal.
- Free Medicare Counseling in New York City: HIICAP vs Brokers, and How to Reach a Counselor — HIICAP gives free, objective Medicare counseling in NYC: 1-800-701-0501 or 212-244-6469. What counselors do, how they differ from brokers, what to bring.
- Medicare Advantage vs Original Medicare in New York: The Decision, Not the Ads — Medicare Advantage or Original Medicare? Networks, referrals and the cost cap differ. In New York you can buy Medigap any time, whatever your health.
This page explains how the system works. It is not medical advice. More.