ICD-11 MMS

21 Symptoms, signs or clinical findings, not elsewhere classified

Mental or behavioural symptoms, signs or clinical findings  (MB20-MB2Y)

MB27 Symptoms or signs involving perceptual disturbance

MB27.2 Hallucinations

MB27.27 Visual hallucinations

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2024-01


Hallucinations involving sight in the absence of an actual visual stimulus that are not restricted to the period of awakening or the onset of sleep. Visual hallucinations may involve formed images, such as of people, or of unformed images, such as flashes of light. Visual hallucinations must be distinguished from illusions, which are visual misperceptions of real external stimuli.

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