You will need to enroll in Medicare Part B at retirement. The standard Part B premium will be $135.50/month in 2019 but those with a high income pay a surcharge called IRMAA.I am 65, still employed, and work for the State of Texas. I have Medicare part A. I plan on retiring next year. I have been working for the State for 25 years, and am vested with lifetime insurance after I retire. My question is this. Is Medicare A all that I need when I retire? Does my State insurance suffice?