Top Questions About Medicare Enrollment Answered by Experts

Aug 13, 2025By Michele Wolfe
Michele Wolfe

Understanding Medicare Enrollment

Medicare can be a complex system to navigate, especially when it comes to enrollment. Designed to provide healthcare coverage for those aged 65 and older, as well as certain younger individuals with disabilities, Medicare has specific enrollment periods and requirements that can be confusing. To help you understand the process, we've gathered top questions about Medicare enrollment and had experts provide clear answers.

medicare enrollment

What Are the Different Parts of Medicare?

Medicare is divided into several parts, each covering different types of healthcare services:

  • Part A: Hospital insurance covering inpatient care, skilled nursing facility care, hospice care, and some home health care.
  • Part B: Medical insurance covering outpatient care, doctor services, preventive services, and some home health care.
  • Part C: Also known as Medicare Advantage, these are plans offered by private companies that include Part A and Part B coverage and often additional benefits.
  • Part D: Prescription drug coverage helping with the cost of prescription medications.

When Can You Enroll in Medicare?

The Initial Enrollment Period (IEP) is the first opportunity for most people to enroll in Medicare. It begins three months before the month you turn 65 and ends three months after. Missing this window can result in penalties or delayed coverage.

calendar reminder

There are also Special Enrollment Periods (SEPs) for those who qualify due to specific circumstances, such as losing employer coverage. Additionally, the General Enrollment Period runs from January 1 to March 31 each year for those who missed their initial opportunity.

How Do I Enroll in Medicare?

Enrolling in Medicare can be done online through the official Social Security website, by phone, or in person at a local Social Security office. It’s important to have your personal information ready, including your Social Security number and details about any current health insurance coverage.

online application

What Happens if I Don’t Enroll on Time?

If you don't enroll in Medicare during your Initial Enrollment Period and don't qualify for a Special Enrollment Period, you may face a late enrollment penalty. For Part B, this penalty could increase your monthly premium by 10% for each year you were eligible but didn’t sign up. For Part D, the penalty is calculated based on how long you went without coverage.

Can I Change My Medicare Plan?

Yes, there are specific periods during which you can change your Medicare plan. The Annual Enrollment Period (AEP) from October 15 to December 7 allows you to make changes to your Medicare Advantage or Part D plans. Additionally, the Medicare Advantage Open Enrollment Period from January 1 to March 31 offers another chance to switch plans or return to Original Medicare.

Understanding these aspects of Medicare enrollment can streamline the process and ensure you receive the healthcare benefits you're entitled to. If you're approaching the age of 65 or have questions about eligibility due to disability, consider reaching out to a Medicare expert for personalized guidance.