A 9-year-old boy is referred to the PMHNP by the school counselor after his parents request help with his behavioral issues. He is in third grade, and although he is doing "fine" academically, he constantly interrupts, fidgets, talks excessively, and gets out of his seat and walks around the classroom. He has friends, but they often get frustrated with him because he talks over them and he wants to play sports nonstop. At home, he can barely stay in his seat to do his homework or eat a meal. He often gets upset with his parents for trying to redirect him to finish his chores or his schoolwork, and they end up sending him to his room. He does show remorse when his behavior is pointed out to him, yet he is unable to inhibit himself. What is the most likely diagnosis?

Choice A reason: Bipolar disorder involves distinct mood episodes (mania or depression) with marked functional changes. This child’s presentation of persistent hyperactivity and impulsivity without episodic mood changes does not fit this diagnosis. Choice B reason: Specific learning disorder affects academic skill acquisition but does not account for hyperactivity, impulsivity, and behavioral regulation difficulties seen across settings. Choice C reason: Generalized anxiety disorder can lead to restlessness or distractibility, but the pattern of constant motor hyperactivity, impulsive behaviors, and difficulty remaining seated is more consistent with ADHD. Choice D reason: ADHD, predominantly hyperactive/impulsive type, is characterized by excessive motor activity, impulsivity, difficulty remaining seated, talking excessively, and inability to inhibit behaviors despite awareness of social norms. The child’s presentation aligns closely with this diagnosis.