The personal and medical information of more than 200,000 residents in Los Angeles may have been exposed in a recent hack of the county’s health department, local officials disclosed on Friday. Law enforcement is investigating. According to a statement from the Los Angeles County Department of Public Health, a hacker successfully obtained the log-in credentials of 53 department employees by sending a phishing email on or around February 19. It was not immediately clear when the hack was discovered but Public Health said it immediately disabled the affected email accounts when it became aware o…