WASHINGTON—Fraud is pervasive in the medical industry and undermines the integrity of the entire health care system, Dr. Mehmet Oz said on April 28. Oz is administrator of the nation’s largest health care system, the Centers for Medicare and Medicaid Services, which spends about $1.7 trillion on medical services each year. “The reason [fraud is] so corrosive is it corrupts the very foundation of the system,” Oz said. “It’s not just the numbers and the dollars.” Oz detailed the problem at a forum conducted by Paragon Health Institute, a Washington-based think tank. Fraud, plus wasteful spending and abusive billing practices, cost Medicare and Medicaid about $100 billion per year, Oz said. ...