Medicare Enrollment
Does Medicare Start Automatically?
Sometimes—but not for everyone. The answer usually depends on whether you are already receiving Social Security or Railroad Retirement Board benefits before you turn 65.
Do not assume you are enrolled. Check.
The plain answer
Some people are enrolled automatically. Others must apply.
If you are already receiving Social Security or Railroad Retirement Board benefits before age 65, you are generally enrolled automatically in Medicare Part A and Part B. If you are not receiving those benefits, Medicare usually will not simply begin on its own—you need to sign up.
Find your situation
Which one sounds like you?
Your enrollment path can change based on what is happening when you become eligible.
I already receive Social Security
You will generally be enrolled automatically in Part A and Part B. Your Medicare card should arrive before coverage begins.
Usually automatic
I am not taking Social Security yet
You generally need to apply for Medicare yourself. Waiting for Social Security until age 67 or 70 does not mean you should wait to handle Medicare.
You usually must apply
I am still working past 65
You may be able to delay Part B without a penalty if you have qualifying group coverage based on current employment—yours or your spouse’s. The employer size and type of coverage matter.
Check before delaying
COBRA and retiree coverage are not the same as active-employment coverage.
They generally do not protect you from a Part B late-enrollment penalty. Do not delay Medicare because someone told you that COBRA “counts.”
What to do next
Three steps before your Medicare start date
Look in your Social Security account for Medicare enrollment details and watch for your Medicare card.
Verify when employer coverage ends and when Medicare Part A and Part B will begin. A gap of even one month matters.
Original Medicare alone does not cover everything. Review Medigap, Medicare Advantage and prescription drug coverage before you enroll.
Not sure whether you should enroll or delay?
Let’s look at your Social Security status, employer coverage, retirement date and Medicare timeline before a missed deadline becomes an expensive mistake.
Official sources: Medicare.gov enrollment guidance and Social Security Medicare enrollment .
This page is educational and does not replace guidance from Medicare or Social Security. Enrollment rules can depend on your individual circumstances.