https://www.navigatingmedicare.com/post/medicare-enrollment-periods-explained-when-you-can-sign-up-or-make-changes 2026-10-02 https://static.wixstatic.com/media/d24f90_bb0f62e796434a4b8bc73b59fa7fe5a5~mv2.jpg Retired couple reviewing Medicare plan options on a tablet at home