If I am applying a communications class from the Health Science Education Guide toward the health science requirement, can the course simultaneously count toward the required five hours of communications education as well? Or would I have to take a second communications class?

A course cannot be used to meet two different requirements. You will need to decide how you want to use your communications class. If the course is counted towards the 14 health science courses, then you will need to take another class for the communications requirement.