CVS Health chief executive officer Karen S. Lynch speaks Monday, Dec. 4th at The Jazz at Lincoln ... [+] Center in New York.Jamel ToppinCVS Health Friday said chief executive officer Karen Lynch has stepped down as the company’s top executive and will be replaced by David Joyner who has been in charge of the company’s Caremark pharmacy benefit company.The news comes as CVS Health has struggled to control healthcare costs in its health insurance businesses and retail pharmacies have struggled, contributing t ...