The post Your Medicare Advantage Plan Stops at the County Line. Original Medicare Doesn’t appeared first on 24/7 Wall St.. A 68-year-old retiree in Phoenix spends three months every summer with her daughter in Vermont. She likes her Medicare Advantage HMO. The premium is $0, the dental benefit is real, and her doctors are five minutes from home. Then she tears a meniscus hiking in Stowe. The emergency room visit is covered. The orthopedic follow…