The document outlines three types of Attention-Deficit/Hyperactivity Disorder (ADHD): Combined Type, Predominantly Inattentive Type, and Predominantly Hyperactive-Impulsive Type. It provides the diagnostic criteria codes and descriptions for each type, including that Combined Type is diagnosed if criteria for both inattentiveness and hyperactivity/impulsivity are met; Inattentive Type is diagnosed if only inattentive criteria are met; and Hyperactive-Impulsive Type is diagnosed if only hyperactive/impulsive criteria are met. Diagnosis requires symptoms to be present for at least the past 6 months.