How do I enroll in Medicare? – HHS.gov

If you would like to file for Medicare only, you can apply by calling 1-800-772-1213. If you are under age 65 and disabled: If you are under age 65 and disabled, and have been entitled to disability benefits under Social Security or the Railroad Retirement Board for 24 months, you will be automatically entitled to Medicare Part A and Part B …

https://www.hhs.gov/answers/medicare-and-medicaid/how-do-i-enroll-in-medicare/index.html