Auditory processing disorder (APD) refers to hearing difficulties that are the result of atypical processing in the central auditory nervous system. The ICD-10-CM (International Statistical Classification of Diseases and Related Health Problems, 10th revision) diagnosis code for central auditory processing disorder (H93.25) describes the condition as “characterized by impairment of the auditory processing, resulting in deficiencies in the recognition and interpretation of sounds by the brain.” The code notes that causes “include brain maturation delays and brain traumas or tumors.” In addition to defining and noting possible causes of APD, this entry discusses hearing problems associated with APD, prevalence and comorbidities of APD, APD in adults, and diagnosis and management of APD.