ICD-11 Criteria for Secondary Catatonia Syndrome (6E69) Secondary catatonia syndrome is a syndrome of primarily psychomotor disturbances, characterized by the co-occurrence of several symptoms of decreased, increased, or abormal psychomotor activity, which occurs as a direct pathophysiological consequence of a medical condition not classified under Mental, Behavioural or Neurodevelopmental Disorders. Examples of medical conditions that may be associated with Catatonia include diabetic ketoacidosis, hypercalcemia, hepatic encephalopathy, homocystinuria, neoplasms head trauma, cerebrovascular disease, and encephalitis. Coding Note:       Use additional code, if desired, for any underlying disorder if known.   6E6Y           Other specified secondary mental or behavioural syndrome Coding Note:       Code aslo the causing condition   6E6Z         ...