I'll be turning 65 this fall, but will work until I'm 66 and remain on my employer's health plan. Would it be alright to sign up for Medicare Part A -- ONLY part A -- when I turn 65? Can't see any downside. After all, it's free …. and I don't have an HSA. Figure then I'll be in the system and I can sign up for Part B later, when I retire. Any thoughts?