Substance use treatment; Treatment for co-occurring substance use plus either serious mental health illness in adults/serious emotional disturbance in children; Outpatient; Intensive outpatient treatment; General Hospital (including VA hospital); Buprenorphine used in Treatment; Naltrexone used in 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; Prescribes buprenorphine; Prescribes naltrexone; Accepts clients using MAT but prescribed elsewhere; Acamprosate (Campral®); Disulfiram; Buprenorphine with naloxone; Naltrexone (oral); Naltrexone (extended-release, injectable); Medication for mental disorders; Private non-profit organization; State Substance use treatment agency; State department of health; Hospital licensing authority; The Joint Commission; Private health insurance; Cash or self-payment; Adolescents; Young adults; Adult women; Adult men; Seniors or older adults; Clients with co-occurring mental and substance use disorders; Clients with co-occurring pain and substance use disorders; Clients who have experienced trauma; Comprehensive substance use assessment; Outreach to persons in the community; Screening for tobacco use; Screening for substance use; Screening for mental disorders; Breathalyzer or blood alcohol testing; Drug or alcohol urine screening; Aftercare/continuing care; Discharge Planning; Naloxone and overdose education; Outcome follow-up after discharge; Self-help groups; Mentoring/peer support; Health education services other than HIV/AIDS or hepatitis; Substance use disorder education; Smoking/vaping/tobacco cessation counseling; Individual counseling; Group counseling; Family counseling; Smoking not permitted; Children/adolescents; Seniors; Female; Male; Sign language services for the deaf and hard of hearing; Vaping not permitted; Case management service; Social skills development