Substance use treatment; Treatment for co-occurring substance use plus either serious mental health illness in adults/serious emotional disturbance in children; Outpatient; Outpatient day treatment or partial hospitalization; Intensive outpatient treatment; Regular outpatient treatment; In-network prescribing entity; Other contracted prescribing entity; No formal relationship with prescribing entity; Accepts clients using medication assisted treatment for alcohol use disorder but prescribed elsewhere; In-network prescribing entity; Other contracted prescribing entity; No formal relationship with prescribing entity; Accepts clients using MAT but prescribed elsewhere; Brief intervention; Cognitive behavioral therapy; Contingency management/motivational incentives; Substance use disorder counseling; Private for-profit organization; State mental health department; State department of health; Medicaid; Adolescents; Young adults; Adult women; Adult men; Seniors or older adults; Clients with co-occurring mental and substance use disorders; Comprehensive mental health assessment; 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; Professional interventionist/educational consultant; Drug or alcohol urine screening; Discharge Planning; Self-help groups; Housing services; Assistance with obtaining social services; Employment counseling or training; Substance use disorder education; Individual counseling; Group counseling; Family counseling; Smoking permitted in designated area; Children/adolescents; Seniors; Female; Male; Spanish; Mental health services