What Is Medicare Part B?
Medicare Part B covers (see all parts):
Unlike Part A, Part B has a monthly premium. In 2026, most people pay a standard monthly premium (income adjustments may apply).
When Should You Enroll in Medicare Part B?
It depends on your situation. There are three main scenarios:
Turning 65 and Not Working
If you’re turning 65 and do NOT have employer group coverage:
You should enroll in Part B during your Initial Enrollment Period (IEP).
Your IEP lasts 7 months:
Waiting beyond this window can result in penalties.
Turning 65 and Still Working
If you are still working AND covered by a large employer plan (20+ employees):
You may be able to delay Part B without penalty.
You can enroll later during a Special Enrollment Period (SEP) when:
⚠️ Important: COBRA does NOT count as active employer coverage.
This is where many costly mistakes happen.
Missed Your Enrollment Window
If you did not enroll when first eligible and do not qualify for a Special Enrollment Period:
You may have to wait for the General Enrollment Period (GEP):
Late enrollment penalties may apply.
What Is the Part B Late Enrollment Penalty?
Missing your enrollment window can trigger a permanent surcharge. Learn about all Medicare penalties.
If you delay Part B without creditable employer coverage:
Your premium may increase by 10% for each full 12-month period you were eligible but did not enroll.
This penalty:
If you delayed for 3 years, your premium could increase by 30% for life.
This is why timing matters.
Common Part B Enrollment Mistakes
Many people discover mistakes only after coverage gaps or penalties occur.
➡ Read More About Common Medicare MistakesExceptions and Special Enrollment Periods
You may qualify for special enrollment if:
You had active employer coverage
You qualify due to disability
You qualify due to certain life events
You move out of your plan’s service area
Each situation requires careful review.
Should You Enroll in Part B If You’re Still Working?
It depends on:
Enrolling at the wrong time can:
This is not one-size-fits-all.
We Help You Time It Correctly
During your free Medicare review, we:
Evaluate your employment status
Confirm whether your coverage qualifies
Calculate penalty risk
Coordinate Part B with Supplement or Advantage plans
Help complete enrollment paperwork if needed
If you’re already enrolled and everything is correct — we’ll tell you.
If adjustments are needed — you’ll understand why.
Frequently Asked Questions
Can I delay Part B if I’m still working?
Yes, if you have creditable employer coverage from a company with 20+ employees.
Does COBRA count as employer coverage?
No. This is one of the most common Medicare mistakes. COBRA does not protect you from Part B penalties — this is one of the most costly misconceptions.
What happens if I miss my enrollment window?
You may face permanent penalties and delayed coverage. You would need to wait for the General Enrollment Period (January 1 – March 31), with coverage not starting until July 1.
Can I cancel Part B later?
Yes, but it can create future enrollment complications and potential penalties if you need to re-enroll later.
What’s the difference between Part B and Part D penalties?
Part B penalties are 10% of the standard premium per 12-month delay period, while Part D penalties are 1% of the national base premium per uncovered month. Both are typically permanent. Full penalty guide.
Should I also enroll in a Supplement when I get Part B?
If you’re choosing Original Medicare, your 6-month Medigap Open Enrollment starts when Part B begins. This is your best window for guaranteed issue coverage — missing it could mean medical underwriting later.
Explore More Medicare Resources
Medicare Penalties
Understand penalty rules and how to prevent them.
📅Enrollment Deadlines
Every enrollment period explained with dates.
🛡️Supplement Plans
Medigap enrollment windows and coverage options.
💊Part D Coverage
Prescription drug plans and formularies.
⚖️Supplement vs Advantage
Compare the two main Medicare paths.
📖Medicare Glossary
Every term explained simply.