Galveston County Daily News, Nov. 11, 2008 Learning about Medicare's "Diagnostic Related Groups" can save money for patients while helping to contain costs, according to UTMB Dr. Michael Warren in his "It's Your Health" column. However, it doesn't cover all medical conditions. "If you undergo some types of surgery without first talking to a Medicare representative, physician or hospital finance officer, you could find a huge bill in your mailbox," he wrote.