The IB Diploma is a "concurrent" program within the larger ICS High School program. Thus, when a student is taking an IB course they are also taking courses to meet the requirements for an ICS High School Diploma. For more on ICS graduation requirements for the ICS High School Diploma, please see the HS Handbook.
However, the IB Diploma has additional requirements beyond those required for the ICS High School Diploma. These include meeting the IB's course selection requirements, fulfilling the requirements for the Diploma Program's Core and completing the course-specific internally and external graded assessments.