Still Working? Here's How Medicare Fits In
Turning 65 while still working — and still covered by an employer health plan — doesn't always mean you need to enroll in Medicare right away. The right answer usually comes down to one question: how many employees does the employer have?
The Rule That Decides It
Employer Size Changes the Answer
20 or more employees
The employer group health plan is usually considered "primary" — it pays first, before Medicare would. Many people in this situation delay Part B without a late penalty, since they have other creditable coverage. It's still worth considering enrolling in Part A, since it's usually premium-free for most people and can work alongside employer coverage.
Fewer than 20 employees
Medicare usually becomes "primary" — it pays first, and the employer plan pays second, if at all. In this case, it's important to enroll in both Part A and Part B on time, generally during your Initial Enrollment Period, to avoid a coverage gap and a permanent late penalty.
When Coverage Ends
The 8-Month Special Enrollment Period
Once employment or employer coverage ends — whichever happens first — a Special Enrollment Period begins. It generally lasts 8 months, and enrolling in Medicare within that window means no late penalty, even years after turning 65. Waiting past the end of that 8-month window, however, can trigger a permanent late-enrollment penalty, so it's worth marking the date coverage ends and acting well before the window closes.
Weighing the Decision
Employer Coverage or Medicare — Some Signs to Consider
There's no single right answer — it depends on employer size, plan cost, and personal health needs. These general signs can help frame the conversation with a benefits administrator or Social Security.
Signs employer coverage may still make sense
✓ The employer has 20+ employees
✓ The employer plan is considered creditable coverage
✓ Premiums and out-of-pocket costs are low
✓ A spouse is also covered under the same plan
✓ The plan's provider network fits current doctors well
Signs it may be time to add Medicare
→ The employer has fewer than 20 employees
→ Employer premiums or deductibles have risen sharply
→ Retirement or reduced hours are approaching
→ The employer plan doesn't coordinate well with Medicare
→ COBRA or retiree coverage is being offered instead of active employment