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<p><strong>Background:&nbsp;</strong>Hemiballism/hemichorea commonly occurs as a result of a lesion in the subthalamic region.</p><p><strong>Case Report:&nbsp;</strong>A 38‐year‐old male with Parkinson&rsquo;s disease developed intractable hemiballism in his left extremities due to a small lesion that was located adjacent to the right deep brain stimulation (DBS) lead, 10 months after bilateral subthalamic nucleus (STN)‐DBS placement. He underwent a right globus pallidus internus (GPi)‐DBS lead implantation. GPi‐DBS satisfactorily addressed his hemiballism.</p><p><strong>Discussion:&nbsp;</strong>This case offered a unique look at basal ganglia physiology in human hemiballism. GPi‐DBS is a reasonable therapeutic option for the treatment of medication refractory hemiballism in the setting of Parkinson&rsquo;s disease.</p>