When can you enroll in Original Medicare (Parts A and B)?
Most people sign up for Part A (hospital insurance) and Part B (medical insurance) when they're first eligible, typically at age 65.
Signing up at the right time can help you avoid gaps in coverage. However, if you're already covered through an employer group health plan, it might make sense to delay signing up for Medicare coverage. You can sign up for Medicare at these times:
If you don’t enroll when you’re first eligible and don’t qualify for a Special Enrollment Period, you may have to pay late enrollment penalties. You must be enrolled in Original Medicare before you can purchase a Medicare Advantage (Part C) plan or Medicare Supplement insurance.