It seems as if almost every other week a new healthcare megamerger is announced that is supposed to transform the industry. From Walmart-Humana to CVS-Aetna - to the recent announcement in the Dallas market around Baylor, Scott & White and Memorial Hermann - the continuous message is that disruption has arrived and the walls of traditional M&A are falling down. Last year, there were 579 deals for U.S. healthcare targets, the second highest total on record. Why is healthcare M&A so hot?