A 13-year-old boy presents to the PMHNP accompanied by his mother, who complains of a change in behavior for the past 2 months. The mother says her son frequently loses his temper, is easily angered, is resentful, and is spiteful toward her. This behavior started approximately 4 weeks after she and the boy's father separated and the father moved out of the home. Which of the following helps the PMHNP to rule out oppositional defiant disorder (ODD)?

Choice A reason: While ODD generally has an onset before age 12, knowing the age of onset alone does not allow the PMHNP to definitively rule out the disorder. It is a characteristic rather than a diagnostic threshold. Choice B reason: This is incorrect because ODD is a recognized psychiatric diagnosis according to DSM-5. While psychotherapy is a common treatment, dismissing it as “not an actual diagnosis” is inaccurate. Choice C reason: This option outlines a symptom threshold for a shorter period (3 months), but DSM-5 specifies that the behavior must persist for 6 months, making this choice incomplete for diagnostic exclusion. Choice D reason: This is the correct answer. According to DSM-5, ODD is defined by a pattern of angry/irritable mood, argumentative/defiant behavior, or vindictiveness lasting at least 6 months, with at least four symptoms present. The patient’s behavior began only 2 months ago, which helps rule out ODD as the diagnosis at this time.