Joining a Medicare drug plan is your choice. You aren't required to join a Medicare plan, and you shouldn't join until you are sure how it would affect your retiree coverage. In some cases, if you join a Medicare drug plan, you could lose your retiree health coverage as well as your prescription drug coverage. On the other hand, in many cases your retiree plan will work with Medicare to provide your prescription drug coverage. Read the information from your retiree plan carefully. It will help you understand your options. It should also tell you how to contact the plan if you have questions. If there is no information on whom to contact, contact your benefits administrator or the office that answers questions about your coverage.