After moving to West Virginia last year, Steve Kuo signed up for a new insurance plan that would cost him $500 a month. But there was one upside: He knew he was entitled to a free preventive visit. He wanted to take advantage of it, so he made an appointment at a clinic near his new home. But then when he got there, they asked about his medical history and he mentioned prior kidney problems. When he received a bill a few weeks later, he had been charged twice for the same appointment: Once as that free preventive visit, once as an “office sick visit” because of the kidney conversatio...