All good things come to an end. This it true of my Medicare columns and true of making changes to your Medicare plan. The annual enrollment period (or open enrollment period) started Oct. 15 and ends this Friday. What does this mean? Whom does it affect? And … whom does it not? What does it mean? This enrollment period is a guaranteed issue time to join or switch to a Medicare Advantage plan from a supplement (no preexisting conditions are an issue except End Stage Renal Disease). If you miss this opportunity you will not be able to switch again …