If you are receiving Social Security, the Social Security Administration will automatically sign you up at age 65 for Part A and Part B. And, if you are not receiving Social Security, you will need to enroll. Most people who are eligible for premium-free Part A coverage choose to enroll in Part A even if they have other qualifying health coverage because it can help cover costs not included by their existing health coverage. Note that enrolling in Part A will end the ability to contribute to a health savings account (HSA). If you aren’t eligible for premium-free Part A, and don’t have other qualifying health coverage, you should enroll when you’re first eligible in order to avoid a penalty. Contact Social Security to enroll yourself.