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When a student fails to attend school for an extended day period, the attendance is calculated. Once 15 days have passed, the student is dropped.
You will need to update a 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 extract.