
Reaching the age of 65 is more than just a milestone for birthday celebrations—it’s also a crucial time to evaluate your healthcare coverage options, particularly Medicare. For those still in the workforce, deciding whether and when to enroll in Medicare alongside existing employer health insurance requires careful consideration. Here’s a detailed guide on what you need to know about signing up for Medicare if you’re still employed at 65.
Understanding the Basics of Medicare Enrollment
Unlike automatic enrollment for those already receiving Social Security benefits, individuals who are still working at 65 must actively decide to enroll in Medicare. This decision is influenced by various factors, including the size of your employer and the nature of your current health coverage.
Key Factors to Consider When Enrolling in Medicare at 65

Employer Size and Coverage:
- Large Employers (20+ Employees): If you’re covered under a large employer’s health plan, you can delay Medicare enrollment without penalty. This allows you to maintain your current coverage without the need to pay for additional Medicare premiums.
- Small Employers (Fewer than 20 Employees): If your employer is smaller, Medicare becomes the primary payer, meaning you should enroll in Medicare Parts A and B at 65 to avoid any gaps in coverage.
Benefits of Premium-Free Medicare Part A:
- Regardless of your employment status, if you’ve worked at least 10 years (40 quarters), you are eligible for premium-free Medicare Part A, which covers hospital insurance. Enrolling in Part A can provide additional coverage alongside your employer’s plan at no extra cost. This can be particularly beneficial for covering services that may be limited under your employer’s plan.
Deciding on Medicare Part B:
- Medicare Part B covers medical insurance but comes with a monthly premium. Many employed seniors choose to delay Part B enrollment to avoid paying these premiums while still covered by an employer’s plan. In 2024, the Part B premium is $174.70, which can be higher based on your income.
Enrollment Process and Timing:

- You don’t need to notify anyone if you choose to delay Medicare Part B unless you’re receiving Social Security benefits. At the point of retirement or loss of employer health coverage, you have an eight-month special enrollment period to sign up for Medicare Part B without facing late-enrollment penalties.
Importance of Creditable Drug Coverage:
- Ensure your employer’s drug coverage is at least as good as Medicare’s standard Part D plan to avoid late-enrollment penalties for Part D. If it isn’t, you’ll need to sign up for Part D during your initial enrollment period.
Understanding Late-Enrollment Penalties:
- Late enrollment in Medicare Parts B and D can result in permanent penalties, adding significant costs to your monthly premiums. It’s crucial to understand these implications if you delay enrollment.
Re-Entering the Workforce:
- If you retire, enroll in Medicare, and then return to work where you receive employer health coverage, you can cancel Part B. Later, if you retire again, you can re-enroll in Part B during a six-month open enrollment period without penalty.
Bottom Line: Weighing Your Options
For many seniors still working at 65, signing up for Medicare, especially Part A, is a beneficial move that complements existing employer coverage. However, decisions about Part B and Part D depend on individual circumstances, including the nature of your current health insurance and your financial situation. Understanding these nuances ensures that you maintain adequate health coverage without unnecessary expenses.
In any case, it’s wise to discuss your specific situation with a Medicare expert or use resources like the official Medicare website or your local Social Security office to make informed decisions. As healthcare needs and employment circumstances vary greatly among individuals, personalized advice is invaluable in navigating this complex landscape.