To sign up for Medicare, here are the key steps and options for 2025:

1. Determine When to Sign Up:
   • Most people sign up for Part A (Hospital Insurance) and Part B (Medical Insurance) starting 3 months before they turn 65 and up to 3 months after the month they turn 65. This is your Initial Enrollment Period.
   • If you miss this period, you may have to wait for a Special Enrollment Period or pay a late enrollment penalty if you sign up late.
2. How to Sign Up:
   • Online through Social Security: This is the easiest and fastest way. You can create or sign in to your personal my Social Security account at SSA.gov and start a Medicare application to sign up for Part A and/or Part B.
   • By phone or in person: Contact the Social Security Administration or the Railroad Retirement Board if applicable.
   • If you are already receiving Social Security benefits before turning 65, you may be automatically enrolled in Part A and Part B.
   • If you are still working and have health insurance through your or your spouse’s employer, you may qualify for a Special Enrollment Period to sign up later without penalty.
3. What You Need to Sign Up:
   • Personal information such as your Social Security number, birth date, and citizenship status.
   • For online sign-up, you need to create a my Social Security account with a valid email and complete identity verification.
   • If you are enrolling through myGov in Australia, you need to live in Australia and have a current passport or valid visa details.
4. After Signing Up:
   • You will receive a welcome package with your Medicare card by mail.
   • Your Medicare Number on this card is required to access online Medicare services and enroll in plans.

For comprehensive details and to start your enrollment online in the U.S., visit the Social Security website at SSA.gov. For Australia, enroll through the myGov website as guided by Services Australia. In summary, the easiest way to sign up for Medicare in the U.S. is online through Social Security, especially starting 3 months before turning 65. Be sure to sign up during your Initial Enrollment Period to avoid penalties.