“If a graduate student under age 26 goes under medical leave, can they go back under their parents’ insurance?” 

School Interrupted

Dear School Interrupted,

I am assuming that the student was eligible for insurance from the school, and loses the school’s plan by going onto a medical leave. If that is the case, then yes, the student can go back under the parent’s plan. Losing the school’s plan is a “family status change” that allows him or her to enroll in the parent’s plan even though it is not open enrollment.