Cardiovascular and cardiothoracic surgeon Naresh Trehan, the Founder of Medanta hospital chain, has become a billionaire, Moneycontrol reported on Thursday. The 77-year-old became a billionaire with shares of Medanta hospital chain operator Global Health rising over 100% this year. The stock hit a record high of ₹972.55 a share on Thursday, with Global Health's market cap surging to ₹26,010 crore.