From Medicare.gov:Even if you keep working after you turn 65, you should sign up for Medicare Part A. If you have health coverage through your employer or union, Part A may still help pay some of the costs not covered by your group health plan. Call the Social Security Administration at 1-800-772-1213 to sign up. However, you may want to wait to sign up for Medicare Part B if you or your spouse are working and have group health coverage through you or your spouse's employer or union. (See note below if you work for a small company.) However, you can defer Medicare Part B. More information can be found here:http://questions.medicare.gov/cgi-bin/medicare.cfg/php/enduser/popup_adp.php?p_sid=undefined&p_lva=undefined&p_li=undefined&p_faqid=16&p_created=993577374&p_sp=undefined