Medicare Enrollment & Deadlines
Most people know they need to enroll in Medicare around age 65. Between the commercials, the mail, and the conversations, the awareness is there.
What trips people up is not knowing they need to enroll. It is everything that comes after: which enrollment window applies to their situation, what qualifies them for a delay, what happens when they leave employer coverage, and when exactly each deadline kicks in.
Get the timing right and your coverage falls into place. Miss a window, and the consequences can be permanent. This page maps out every key enrollment period and what you need to know about each one.
Medicare Initial Enrollment Period (IEP)
Your Medicare Initial Enrollment Period is a seven-month window built around your 65th birthday. It opens three months before the month you turn 65, includes your birth month, and closes three months after. This is your first and most important enrollment window.
When your coverage starts depends on when you enroll
Enrolling early in your window, during those first three months before your birthday month, generally means your coverage begins right away. Waiting until your birthday month or later shifts your start date. For most people, earlier enrollment means fewer coverage gaps.
What happens if you miss your IEP?
If you do not have qualifying employer coverage and you miss your Initial Enrollment Period, you typically have to wait for the General Enrollment Period to sign up, and a late enrollment penalty gets added to your Part B premium. That penalty is permanent. It does not expire after a few years or go away when your situation changes. We have worked with clients who came to us after this happened. It is not always fully correctable, which is exactly why we have the timeline conversation before it becomes a problem.
Medicare General Enrollment Period (GEP)
The Medicare General Enrollment Period runs from January 1 through March 31 each year.
This is the fallback window for people who missed their Initial Enrollment Period and did not qualify for a Special Enrollment Period. Coverage begins July 1 for people who enroll during this window.
If you are enrolling through GEP, there will likely be a gap between when your prior coverage ended and when Medicare starts. Planning ahead is the only way to avoid that gap, and it is one of the main reasons we encourage people to start the enrollment conversation well before any major coverage transition.
Medicare Special Enrollment Period (SEP)
A Medicare Special Enrollment Period is triggered by a qualifying life event.
The most common trigger for the people we work with is losing employer-sponsored health coverage because you or a covered spouse stopped working. When that happens, a window opens to enroll in Medicare without penalty.
The COBRA misconception
This is one of the most common and costly misunderstandings we see. When you leave your job and elect COBRA coverage, many people assume the clock on their enrollment window has not started yet because they still have insurance. It has. The Special Enrollment Period begins the month after your employment or underlying employer coverage ends, not when COBRA runs out. Waiting out your full COBRA period, expecting your enrollment window to open at the end, can leave you without a penalty-free option. This is exactly the kind of thing that is easy to miss and very hard to undo.
Other events that trigger a Special Enrollment Period
- Moving out of your plan’s service area
- Losing Medicaid or Extra Help eligibility
- Returning to the United States after living abroad
- Gaining or losing other qualifying coverage
Medicare Annual Enrollment Period (AEP)
Once you are enrolled in Medicare, you have an Annual Enrollment Period from October 15 through December 7 each year.
During this window, you can switch between Medicare Advantage and Original Medicare, change your Advantage plan, or change your Part D drug plan. Changes take effect January 1 of the following year.
Because every Medicare client in Connecticut is on the same annual enrollment season, we build our entire fall calendar around it. Starting in July, we reach out to every active Medicare client with a series of touchpoints to schedule a review before the window opens. If we have not connected by the end of September, we follow up directly. Carriers release their updated plan information in late summer, and we go through that information before open enrollment begins so we know what has changed and what the strongest options are for the coming year.
A plan that was the right fit last year may not be the best option this year. That review is part of what ongoing service actually means.
Medicare Advantage Open Enrollment Period
If you are enrolled in a Medicare Advantage plan, there is an additional window from January 1 through March 31.
During this period, you can switch to a different Advantage plan or return to Original Medicare and add a Part D plan. This window can be used once per year.
Medicare Penalties:
What They Are and How to Avoid Them
Part B Late Enrollment Penalty
If you do not enroll in Part B when you are first eligible and you do not have qualifying employer coverage, a late enrollment penalty gets added to your monthly Part B premium. The penalty increases with each 12-month period you go without coverage, and it is permanent. We map out your enrollment timeline early specifically to make sure this never happens.
Part D Late Enrollment Penalty
If you go more than 63 consecutive days without qualifying drug coverage after becoming Medicare-eligible, a Part D late enrollment penalty applies. Like the Part B penalty, it is permanent and gets added to your monthly premium. The longer you go without coverage, the higher it becomes.
How we help you avoid both
The penalty conversation happens at the very beginning of working together. Before anyone makes an enrollment decision, we map out their timeline, confirm whether their existing coverage qualifies, and make sure they know exactly when each window opens and closes. No guessing.
Enrollment Questions We Hear Regularly
Click on a question to find out more.
If you are already receiving Social Security benefits when you turn 65, you will typically be enrolled in Medicare Part A and Part B automatically, and your Medicare card will arrive in the mail before your birthday. You will still need to choose a plan type and, if applicable, a Part D drug plan. Automatic enrollment in Medicare is not the same as being set up with complete coverage.
Yes, but the timing and the options depend on what you want to change and when. Most plan changes happen during the Annual Enrollment Period each fall. Switching between plan types outside of specific protected windows may involve additional steps. We walk clients through the change rules before they make any moves so there are no surprises.
ACA marketplace open enrollment is separate from Medicare open enrollment. If you miss it, you generally cannot enroll until the next open enrollment period unless a qualifying life event triggers a Special Enrollment Period. We can help you figure out whether your situation qualifies and what your options are in the meantime.
Know Your Window Before It Closes
The most important thing about Medicare enrollment is knowing exactly where you stand before a deadline hits, not after. If you are approaching 65, planning a retirement transition, or trying to untangle a coverage situation that already got complicated, let us work through it with you. All consultations are complimentary.