True. The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) classifies anxiety disorders as a group of conditions that fall under Axis I of the classification system. Axis I of the DSM-5 is used to classify clinical disorders and other conditions that may be a focus of clinical attention. Anxiety disorders are a group of conditions that include generalized anxiety disorder, panic disorder, social anxiety disorder, specific phobias, and separation anxiety disorder, among others. These disorders are characterized by excessive and persistent worry, fear or anxiety that causes significant distress and impairment in daily functioning.