Vineet Arora, an assistant dean and associate professor of medicine at University of Chicago's Pritzker School of Medicine is part of small but growing movement of doctors and medical students who are trying to add "do no financial harm" to the Hippocratic oath taken by doctors and other medical personnel. According to a 2005 Harvard study, medical bills are the No. 1 cause of bankruptcy in the U.S. Yet, of the $2.6 trillion spent each year on health costs, about 30 percent of that is not actually helping patients, and in some cases hurts them, said Steven Weinberger, CEO and executive vice president of the American College of Physicians.