The Medicare program offers several enrollment windows throughout the year, and one of the most important is the General Enrollment Period (GEP). This timeframe (January 1 through March 31) allows individuals who missed their Initial Enrollment Period to sign up for Medicare Part A and/or Part B.
If you enroll during this time, your coverage begins the first day of the month after you apply. However, waiting until the GEP can sometimes mean facing late enrollment penalties, so it’s best to understand all your options before this point.
Who Needs to Use the General Enrollment Period?
You’ll typically need the General Enrollment Period if:
- You missed your Initial Enrollment Period, and
- You don’t qualify for a Special Enrollment Period
Let’s take a closer look at how those other enrollment periods work.
The Initial Enrollment Period (IEP)
Your Initial Enrollment Period is a one-time, seven-month window centered around your 65th birthday. It begins three months before your birthday month, includes your birthday month, and ends three months after.
For example:
- If your 65th birthday is June 15, your IEP runs from March 1 to September 30.
- If your birthday falls on June 1, your IEP starts February 1 and ends August 31.
Signing up during your IEP helps you avoid late penalties and ensures your coverage starts when you need it.
The Special Enrollment Period (SEP)
A Special Enrollment Period is available when you lose active, creditable employer coverage.
You’ll have eight months to sign up for Medicare Parts A and B after your employer coverage ends or after you stop working, whichever happens first. To qualify, you or your spouse must have been actively employed by a company with 20 or more employees during that coverage period.
For instance, if your employer coverage ends October 31, your SEP runs until June 30 of the following year. Enrolling within that timeframe protects you from penalties or delayed benefits.
It’s important to note that COBRA coverage does not count as active employer coverage. Even if you choose COBRA, you’ll still need to enroll in Medicare during the first eight months to avoid penalties.
What Happens If You Wait Until the General Enrollment Period?
If you delay Medicare enrollment and miss both your IEP and SEP, the General Enrollment Period is your next opportunity. While it gives you another chance to sign up, there are drawbacks. You may have late enrollment penalties and potential gaps in coverage.
Starting in 2023, individuals who enroll during the GEP will have coverage beginning the month after they apply, which is an improvement from previous years when benefits were delayed longer.
Understanding Medicare Late Enrollment Penalties
Medicare penalties vary depending on the part you delay enrolling in:
Part A
Most people qualify for premium-free Part A, so penalties are uncommon. However, if you must pay a premium and delay enrollment, you may owe an additional 10% for twice the number of years you delayed coverage.
Part B
The Part B penalty adds 10% of the standard monthly premium for each 12-month period you were eligible but not enrolled. This penalty is permanent and added to your monthly premium.
Example: If the standard Part B premium in 2026 is $202.90 and you delay enrollment for three years, your premium would increase to about $263.77 per month.
Part D
The Part D (prescription drug coverage) penalty is 1% of the national base premium (approximately $38.99 in 2026) for each month you went without creditable coverage.
Example: If you waited 36 months, your penalty would be roughly $14 added to your monthly premium.
You can avoid these penalties if you maintain creditable coverage (meaning coverage considered as good as or better than Medicare) during the time you delay enrollment.
How to Enroll During the General Enrollment Period
You can apply for Medicare during the GEP in several ways:
- Online: The easiest method is to apply directly through the Social Security Administration’s website.
- By phone: Call Social Security to complete your enrollment.
- In person: Visit your local Social Security office.
If you already have Part A and need to add Part B, you’ll need to fill out and submit Form CMS-40B.
After you’re enrolled in both Parts A and B, you can choose how you want to receive your Medicare coverage:
- A Medicare Supplement (Medigap) plan to help cover out-of-pocket costs
- Or a Medicare Advantage plan that combines hospital, medical, and sometimes drug coverage
You have six months from your Part B effective date to enroll in a Medigap plan without medical underwriting.
Need Guidance? Carolina Senior Benefits Can Help
Enrolling in Medicare can be confusing, especially if you’ve missed your initial window or are unsure which coverage path is best for you. At Carolina Senior Benefits, our licensed agents can walk you through every step, help you understand your enrollment options, and compare plans that fit your needs and budget.
