IF A CHILD IS SICK...IS THAT CONSIDERED PREVENTIVE CARE?

WE HAVE AN HMO PLAN....AND ACCORDING TO THE INSURANCE MINUS WHAT OUR CARDS SAY...IT STATES THAT SPECIALIST AND PRIMARY CARE PHYSICANS ARE COVERED AT NO COST FOR PREVENTIVE TILL OVER 18! I UNDERSTAND THAT INCLUDES THE NORMAL VISITS BY AGE....BUT DOES IT COVER AT 100 PERCENT IF YOUR CHILD HAS THE FLU AND YOU NEED TO GET THEM IN WITH THE PCP? OR IS THAT WHERE A COPAY APPLIES!!! PLEASE HELP!!!!!!!!!!!!