To be licensed under this subtitle, an intensive outpatient treatment level 2.1 program shall provide structured outpatient substance-related disorder treatment based on a comprehensive assessment, for: Individuals who meet the ASAM Criteria for level 2.1; and Adults, from 9 to 20 hours weekly, and individuals younger than 18 years old for 6 to 20 hours weekly. An intensive outpatient treatment level 2.1 program may provide the following services if the program’s license specifically authorizes the services: A withdrawal management service as described in Regulation .18 of this chapter; and An opioid treatment service as described in Regulation .19 of this chapter.