Ill. Admin. Code tit. 77, § 380.210
a) Each individualized treatment plan that is implemented by a facility shall be developed with the following principles:
b) For triage, the treatment plan shall be initiated on admission and shall be updated prior to discharge. For crisis stabilization, the treatment plan shall be updated at least once every seven days. For transitional living, the treatment plan shall be updated at least once every 30 days. For recovery and rehabilitation supports, the treatment plan shall be updated at least quarterly. For crisis stabilization, transitional living, and recovery and rehabilitation supports, the treatment plan shall be updated whenever there has been a change in the consumer's clinical function that has prompted a re-assessment. When updated, the treatment plan shall reflect: