Substance use treatment; Treatment for co-occurring substance use plus either serious mental health illness in adults/serious emotional disturbance in children; Outpatient; Outpatient methadone/buprenorphine or naltrexone treatment; Regular outpatient treatment; Buprenorphine used in Treatment; Naltrexone used in Treatment; In-network prescribing entity; Does not use medication assisted treatment for alcohol use disorder; Buprenorphine maintenance; Prescribes buprenorphine; Prescribes naltrexone; Relapse prevention with naltrexone; Accepts clients using MAT but prescribed elsewhere; Buprenorphine with naloxone; Naltrexone (oral); Clonidine; Medication for mental disorders; Cognitive behavioral therapy; Contingency management/motivational incentives; Substance use disorder counseling; Trauma-related counseling; Telemedicine/telehealth therapy; Private for-profit organization; Drug Enforcement Agency (DEA); Medicare; Private health insurance; Cash or self-payment; Comprehensive mental health assessment; Comprehensive substance use assessment; Screening for substance use; Drug or alcohol urine screening; Aftercare/continuing care; Treatment for other addiction disorder; Individual counseling; Marital/couples counseling; Smoking permitted without restriction; Adults; Children/adolescents; Female; Male; Vaping permitted without restriction; Mental health services