Focusing on major depressive disorder and persistent depressive disorder (dysthymia), this program examines their DSM-5 TR diagnostic criteria and related ICD diagnoses (F30-F39). It considers how duration and other symptoms of depression affect the diagnosis and differentiates major depressive disorder from disruptive mood dysregulation disorder, premenstrual dysphoric disorder, substance/medication-induced depressive disorder, and depressive disorder due to another medication.