When a student fails to attend school for an extended day period, the attendance is tallied. Once 15 days have passed, the student is dropped.
You will need to update the W9XX when it is still attached to the current enrollment record or when it is attached to a previous school's re-enrollment record. If a student returns to the same school, you won't have to update the W9XX exit code. This code is reported on the EOY Student Record Collection extract.