Children/adolescents; Female; Male; Case management service; Transportation assistance; Substance use treatment; Outpatient; Intensive outpatient treatment; Regular outpatient treatment; Other contracted prescribing entity; Accepts clients using MAT but prescribed elsewhere; Tribal government; State Substance use treatment agency; IHS/Tribal/Urban (ITU) funds; Medicare; Cash or self-payment; State-financed health insurance plan other than Medicaid; Adult women; Pregnant/postpartum women; Adult men; Comprehensive substance use assessment; Interim services for clients; Outreach to persons in the community; Screening for tobacco use; Screening for substance use; Screening for mental disorders; Drug or alcohol urine screening; Aftercare/continuing care; Discharge Planning; Outcome follow-up after discharge; Assistance with obtaining social services; Mentoring/peer support; HIV or AIDS education, counseling, or support; Hepatitis education, counseling, or support; Health education services other than HIV/AIDS or hepatitis; Substance use disorder education; Individual counseling; Group counseling; Family counseling; Smoking permitted without restriction