Substance use treatment; Detoxification; Outpatient; Outpatient detoxification; Intensive outpatient treatment; Outpatient methadone/buprenorphine or naltrexone treatment; Regular outpatient treatment; Methadone used in Treatment; Other contracted prescribing entity; Does not treat alcohol use disorder; Federally-certified Opioid Treatment Program; Methadone maintenance; Accepts clients using MAT but prescribed elsewhere; Methadone; Substance use disorder counseling; Private for-profit organization; State Substance use treatment agency; Commission on Accreditation of Rehabilitation Facilities (CARF); SAMHSA certification for opioid treatment program (OTP); Cash or self-payment; Clients with co-occurring mental and substance use disorders; Clients with co-occurring pain and substance use disorders; Complete medical history/physical exam; Screening for substance use; Drug or alcohol urine screening; Discharge Planning; Opioids detoxification; Medication routinely used during detoxification; Individual counseling; Group counseling; Family counseling; Marital/couples counseling; Smoking not permitted; Adults; Young adults; Female; Male; Opioid use disorder clients only; Vaping not permitted; Case management service; Mental health services