In many cases, applying for Medicare is AUTOMATIC.
Most beneficiaries become eligible for Medicare at age 65.
If you are already receiving Social Security benefits at the time you become eligible for Medicare your enrollment happens automatically.
Example: Gary decided to start receiving his Social Security benefits at age 63 and will become eligible for Medicare at age 65. Applying for Medicare requires no action on his part, and his enrollment is automatic. The Medicare card simply shows up in his mailbox about 2-3 months before his 65th birthday.