Working Past 65 With Employer Under 20? Enroll in Part B

Usually when you are first eligible. With fewer than 20 employees, Medicare generally pays first at 65 even if you are still working, so delaying Part B can create claim and penalty risk.

Frequently Asked Questions

Can I wait to enroll in Part B while working for a small employer?
Generally no. With fewer than 20 employees, Medicare is primary at 65 even while you are actively working. Waiting to enroll leaves you without primary coverage and risks a permanent penalty.
Will I get an 8-month SEP when I leave my small employer?
Not necessarily. The 8-month SEP after losing active-employer coverage applies reliably when the employer has 20 or more employees. With a small employer, this protection may not apply. Contact Social Security for your specific situation.
My employer helps pay my Part B premium -- does that change the rule?
No. Whether your employer helps with your Part B premium is separate from the question of whether Medicare is primary. For small employers, Medicare is still primary at 65 regardless of premium arrangements.