About%20the%20MyChart%20Patient%20Portal.%20Effective%20Saturday%2C%20February%2024%2C%202018%2C%20we%20transitioned%20to%20My%20Lahey%20Chart%20%28%22MyChart%22%29%20Patient%20Portal.This%20transition%20corresponded%20with%20the%20launch%20of%20Epic%2C%20our%20electronic%20health%20record%20that%20connects%20all%20of%20our%20healthcare%20providers%20through%20one%20system..