Active employer coverage
Some people can delay Part B without a penalty while covered through current employment. Confirm the rules with the employer and Medicare before delaying enrollment.
Turning 65 Resources
If you or your spouse will still have job-based insurance at 65, the right Medicare timing depends on the type of coverage and who provides it. Start with the broader turning-65 Medicare guide, then use this page to focus on employment coverage.

Ask whether your insurance is current-employment group health coverage and whether Medicare would pay first or second. Do not assume that retiree coverage, COBRA, or other continuation coverage gives you the same enrollment protections as active-employment coverage. Use these questions to ask your employer before delaying Medicare.
Some people can delay Part B without a penalty while covered through current employment. Confirm the rules with the employer and Medicare before delaying enrollment.
COBRA generally does not extend the limited Part B Special Enrollment Period. Waiting until COBRA ends can lead to a coverage gap or late-enrollment penalty.
Retiree coverage may require enrollment in Medicare Parts A and B and may coordinate benefits differently from active employee insurance.
Is the coverage based on your current employment or your spouse’s current employment?
How many employees does the employer have, and which coverage pays first?
Is your prescription coverage considered creditable for Medicare Part D?
Will enrolling in Medicare affect coverage for a spouse or dependent?
Could enrolling in Part A affect Health Savings Account contributions?
What documents will you need when applying during a Special Enrollment Period?
Medicare advises people with HSAs to review contribution timing carefully because retroactive Medicare coverage can create tax consequences. Confirm the timing with Medicare, Social Security, the employer, and a qualified tax professional.
Confirm your Medicare effective date and any additional coverage before cancelling employer insurance. If you are leaving work, the Part B Special Enrollment Period generally begins when employment or qualifying coverage ends, whichever happens first.
Review official Medicare guidanceBring your coverage information, doctors, prescriptions, preferred pharmacies, and questions for a personalized plan review. The Medicare plan review checklist can help you prepare.
Request a plan review