Substance use treatment; Transitional housing, halfway house, or sober home; 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; Naltrexone used in Treatment; In-network prescribing entity; Does not treat alcohol use disorder; Prescribes naltrexone; Accepts clients using MAT but prescribed elsewhere; Disulfiram; Naltrexone (oral); Naltrexone (extended-release, injectable); Medication for mental disorders; Brief intervention; Cognitive behavioral therapy; Community reinforcement plus vouchers; Motivational interviewing; Matrix Model; Relapse prevention; Substance use disorder counseling; Telemedicine/telehealth therapy; Trauma-related counseling; 12-step facilitation; Private for-profit organization; State Substance use treatment agency; State department of health; Medicaid; Private health insurance; Cash or self-payment; State-financed health insurance plan other than Medicaid; Clients with co-occurring mental and substance use disorders; Comprehensive mental health assessment; Comprehensive substance use assessment; Screening for tobacco use; Screening for substance use; Screening for mental disorders; Drug or alcohol urine screening; Aftercare/continuing care; Discharge Planning; Self-help groups; Housing services; Assistance with obtaining social services; Mentoring/peer support; Substance use disorder education; Individual counseling; Group counseling; Family counseling; Smoking permitted in designated area; Adults; Children/adolescents; Female; Male; Vaping permitted without restriction; Case management service; Mental health services; Social skills development; Transportation assistance