Barbara Irizarry-Luke. Her primary practice is as a Registered Nurse, also practicing as a Registered Nurse: Addiction (Substance Use Disorder), a Registered Nurse: Case Management, a Registered Nurse: Diabetes Educator, a Registered Nurse: Psych/Mental Health, Child & Adolescent, a Registered Nurse: Psych/Mental Health, and a Registered Nurse: Psych/Mental Health, Adult.