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Chorea has often been associated with lesions in the basal ganglia and in the sub thalamic nucleus. It is possible for a patient with chorea-ballismus to have hyperglycemia at the initial presentation. We hereby present a case of an 81-year-old female, who was on treatment for type 2 diabetes mellitus and presented to us with sub acute onset of abnormal movements of right side of the body. She had semi purposeful, rapid and jerky movements of right upper limb and lower limb along with abnormal tongue movements. Laboratory data showed very high blood glucose levels, urine ketones were positive and pH of arterial blood was normal. MRI brain showed hyperintensities in right basal ganglia. So, hyperglycemia induced hemichorea was considered as a possibility and she was treated with insulin. These abnormal movements decreased subsequently with treatment and patient is doing better in the follow-up visits. This presentation is extremely rare, as review of literature showed similar presentations in patients with non ketotic hyperglycemia but not reported so far in diabetic ketosis. [ABSTRACT FROM AUTHOR]