Do I need to sign up for Medicare Part B if I am working and have health insurance through an employer?

Navigating Medicare Part B enrollment while employed with employer health coverage

Modified on:
July 29, 2025 10:00 pm

Making decisions about Medicare Part B enrollment while you’re still working and covered by employer health insurance can be complex. Let’s break down the key considerations to help you make an informed choice.

Understanding Medicare Part B

Medicare Part B covers outpatient services, such as doctor visits, preventive care, and certain therapies. Unlike Part A, which typically doesn’t require a premium, Part B comes with a monthly premium.

Should you enroll in Medicare Part B if you have employer health insurance?

If you’re still working and have health insurance through your employer, you might be able to delay enrolling in Medicare Part B without facing penalties. This largely depends on the size of your employer:

  • Employers with 20 or more employees: Your employer’s insurance is considered primary, meaning it pays first. In this case, you can delay enrolling in Part B without penalty.
  • Employers with fewer than 20 employees: Medicare becomes the primary payer, and your employer’s insurance is secondary. Here, it’s advisable to enroll in Part B to ensure coverage and avoid potential penalties.

What is the special enrollment period (SEP) for Medicare Part B?

If you delay Part B enrollment due to having employer-based health coverage, you’re entitled to a Special Enrollment Period (SEP) once that coverage ends. This SEP lasts for eight months, starting from the month after your employment or coverage ends, whichever comes first. Enrolling during this period helps you avoid late enrollment penalties.

Consequences of delaying Medicare Part B enrollment

Not enrolling in Part B when required can lead to significant penalties:

  • Late enrollment penalty: For each 12-month period you could have had Part B but didn’t sign up, your monthly premium may increase by 10%. This penalty is permanent.
  • Coverage gaps: Without Part B, certain medical services might not be covered, leading to higher out-of-pocket costs.

How does employer size affect Medicare enrollment decisions?

The size of your employer plays a crucial role in determining your Medicare enrollment strategy:

  • Large employers (20 or more employees): Your employer’s insurance typically remains primary. You can delay Part B enrollment without penalty.
  • Small employers (fewer than 20 employees): Medicare becomes the primary payer. Delaying Part B in this scenario can result in lack of coverage and potential penalties.

Should you enroll in Medicare Part A while still employed?

Most individuals qualify for premium-free Medicare Part A and often choose to enroll upon turning 65, even if they’re still working. However, if you’re contributing to a Health Savings Account (HSA), enrolling in any part of Medicare can affect your HSA contributions. It’s essential to consult with your benefits administrator to understand how enrolling in Part A might impact your specific situation.

Coordinating employer insurance with Medicare

Understanding how your employer’s insurance coordinates with Medicare is vital:

  • Primary vs. secondary payer: Depending on employer size, either your employer’s insurance or Medicare will pay first. Knowing this helps in making informed enrollment decisions.
  • Coverage differences: Some employer plans might not cover services once you’re eligible for Medicare, even if you haven’t enrolled. Reviewing your plan’s terms is crucial.

Steps to take before making a decision

Before deciding on Medicare Part B enrollment:

  1. Consult your employer’s benefits administrator: They can provide insights into how your current coverage works with Medicare.
  2. Review your health coverage: Understand what your employer’s plan covers and how it coordinates with Medicare.
  3. Consider future plans: If you’re planning to retire soon, strategize your Medicare enrollment to ensure continuous coverage.

Navigating Medicare decisions while employed requires careful consideration of your specific circumstances. By understanding the interplay between employer coverage and Medicare, you can make choices that best suit your healthcare needs.

Related article:

Bad news for the COLA increase in 2026 – The Americans who will suffer the most despite the 2.7% inflation adjustment (and it’s not just because of Medicare)

Bad news for COLA adjustment in 2026 – Increase will be 2.7% for Social Security checks, but with a condition for Medicare

Goodbye Medicare as you know it – Changes with the WISeR model coming Jan. 1, 2026 in these states with affected services

Enobong Demas
Enobong Demashttps://polifinus.com/author/e-demas/
I write on social welfare programs and initiatives for the United States, focusing on how these programs impact the lives of everyday Americans. My background in environmental sciences allows me to approach these topics with a unique analytical lens to provide my readers with a clear and well-rounded insight, eliminating the complexities often common with these topics.

Must read

Related News