Yes. The employee needs to follow your department’s call-in procedures (e.g., when to call, whom to call) for intermittent or unplanned absences. Make sure these rules are known and evenly applied to everyone.
The Service & Maintenance bargaining contract status in part:
Employees must notify the Director or appropriate Supervisor in charge of the shift, if available, of their illness as early as possible, but in any case no more than one-half (1/2) hour following the starting time, in order to be paid sick leave, unless a later time is approved by the Director.
Per Federal FML Guidelines:
For planned medical treatment, the employee must consult with the employer and try to schedule the appointment at a time that minimizes the disruption to the employer. The employee should consult with the employer prior to scheduling the treatment in order to arrange a schedule that best suits the needs of both the employee and employer.
When the need for leave is unexpected, the employee must provide notice to the employer as soon as possible and practical. It should generally be practicable for the employee to provide notice of leave that is unforeseeable within the time required by the employer’s usual and customary notice requirements. For example, if the employee’s child has a severe asthma attack and the employee takes the child to the emergency room, the employee is not required to leave the child to report the absence while the child is receiving emergency treatment.