I started Medicare A in 2013 when I turned 65. In the years since, I have remained on my husband's employer group insurance, so did not need Medicare B. Although he still has this insurance, I would like to change to Medicare B. It's not clear how I do this so that Medicare B will begin Jan. 1, 2019 to coincide with my other insurance ending Dec. 31, 2018.
Do I qualify for special enrollment? If so, how do I do this? The group insurance deadline is Nov. 16, 2018, so I need to know soon whether I can not re-enroll and change to Medicare B.