Substance use treatment; Treatment for co-occurring substance use plus either serious mental health illness in adults/serious emotional disturbance in children; Outpatient; Regular outpatient treatment; Does not treat alcohol use disorder; Does not treat opioid use disorders; Cognitive behavioral therapy; Motivational interviewing; Substance use disorder counseling; Trauma-related counseling; Telemedicine/telehealth therapy; Private for-profit organization; State Substance use treatment agency; State mental health department; Commission on Accreditation of Rehabilitation Facilities (CARF); Medicare; Medicaid; Federal military insurance (e.g., TRICARE); Private health insurance; State-financed health insurance plan other than Medicaid; Payment assistance (check with facility for details); Sliding fee scale (fee is based on income and other factors); Adolescents; Young adults; Adult women; Adult men; Lesbian, gay, bisexual, transgender, or queer/questioning (LGBTQ); Veterans; Active duty military; Members of military families; Criminal justice (other than DUI/DWI)/Forensic clients; Clients with co-occurring mental and substance use disorders; Clients with HIV or AIDS; Clients who have experienced sexual abuse; Clients who have experienced intimate partner violence, domestic violence; Clients who have experienced trauma; Comprehensive mental health assessment; Interim services for clients; Outreach to persons in the community; Aftercare/continuing care; Discharge Planning; Outcome follow-up after discharge; Self-help groups; Assistance with obtaining social services; Substance use disorder education; Smoking permitted in designated area; Adults; Children/adolescents; Female; Male; Sign language services for the deaf and hard of hearing; Case management service; Social skills development