If your 2020 Medicare coverage includes an Advantage Plan that’s not a great match, you might be able to part ways with it. During an enrollment window that opened Jan. 1 and closes March 31, you can swap your plan for another or drop it and return to basic Medicare (Part A hospital coverage and Part B outpatient coverage). Yet, before you make a change, be sure you’re aware of potential snags and any restrictions involved. Also possible through March 31: If you missed your initial Medicare enrollment period and don’t qualify for an exception, you can sign up now. If this is your situation, coverage won’t start until July 1, said Elizabeth Gavino, founder of Lewin & Gavino in New York and an independent broker and general agent for Medicare plans.