With Open Enrollment ending March 31 for Medicare Advantage plans, Axios reports enrollment rates have increased 9.4 percent over the same time period last year. Medicare Advantage plans are a type of Medicare health plan offered by a private company that contracts with Medicare to provide all your Part A and Part B benefits. Most Medicare Advantage Plans also offer prescription drug coverage. The number of plans available in each county in Pennsylvania varies from 45 plans in Susquehanna County to 61 in Lancaster. To view plan information by county, click here.