Medicare General Enrollment Period – Who Can Use It
Medicare offers several enrollment windows, and knowing which one applies to your situation is essential for avoiding coverage gaps and late-enrollment penalties. One key enrollment period; especially for those who missed their initial opportunity, is the Medicare General Enrollment Period (GEP).
For those who didn’t sign up for Medicare when first eligible, the GEP may provide a second chance to enroll. Let’s break down what the GEP is, who qualifies to use it, and what to expect.
Understanding the Medicare General Enrollment Period
The Medicare General Enrollment Period runs every year from January 1 to March 31. It exists to help individuals who:
- Did not enroll in Medicare Part A and/or Part B during their Initial Enrollment Period (IEP), and
- Do not qualify for a Special Enrollment Period (SEP)
During the GEP, eligible individuals can sign up for Medicare Part A (if they have to pay a premium for it), Medicare Part B, or both.
Watch a YouTube video on Medicare Enrollment Periods
Who Can Use the GEP
You may be able to use the Medicare General Enrollment Period if:
- You turned 65 and missed your Initial Enrollment Period
- You left employer coverage and did not enroll during a Special Enrollment Period
- You declined Medicare when first eligible and later changed your mind
- You were not automatically enrolled and never completed enrollment
You cannot use the GEP if
You already enrolled or declined Medicare during your IEP or SEP
You currently qualify or applied for a Special Enrollment Period (for example, due to loss of employer coverage)
When Coverage Begins After Enrolling
Unlike past years when coverage began in July, Medicare’s updated rules mean that coverage starts the first day of the month after you enroll during the GEP.
For example:
- Enroll in January – Coverage starts February 1
- Enroll in March – Coverage starts April 1
What About Late-Enrollment Penalties
If you’re enrolling during the GEP because you didn’t qualify for a Special Enrollment Period, be aware that late-enrollment penalties may apply:
- Part B penalty: 10% increase for each full 12-month period you didn’t enroll when eligible
- Part A penalty: Applies if you’re required to pay a premium and delayed enrollment
These penalties typicallylast for a lifetime, so enrolling as soon as you’re eligible; or using a SEP if qualified, is critical.
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Can You Enroll in Medicare Advantage or Part D After the GEP
Yes. After enrolling in Medicare during the GEP, you have a Medicare Advantage and Part D enrollment window from April 1 to June 30 each year.
During this time, you can:
- Join a Medicare Advantage (Part C) plan
- Enroll in a standalone Part D prescription drug plan
Missing your Initial Enrollment Period doesn’t mean you’re out of options. The Medicare General Enrollment Period offers an important second chance to gain coverage, but acting promptly is key.
If you’re unsure whether you qualify for the GEP or a Special Enrollment Period, consider speaking with a licensed Medicare agent who can help you understand your enrollment options and avoid unnecessary penalties or coverage delays.


















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