Symptoms or signs involving perceptual disturbance

Description

Symptoms and signs involving a disruption in sensory perception, including depersonalization, derealization, and hallucinations in any modality. [1]

Subcategories

• MB27.0 Depersonalisation

  Experiencing the self as strange or unreal, or feeling detached from, or as though one were an outside observer of, one’s thoughts, feelings, sensations, body, or actions. Depersonalization may take the form of emotional and/or physical numbing, a sense of watching oneself from a distance or ‘being in a play’, or perceptual alterations (e.g., a distorted sense of time). [1]

• MB27.1 Derealisation

  Experiencing other persons, objects, or the world as strange or unreal (e.g., dreamlike, distant, foggy, lifeless, colourless, or visually distorted) or feeling detached from one’s surroundings. [1]

• MB27.2 Hallucinations

  Sensory perceptions of any modality occurring in the absence of the appropriate (external) stimulus. The person may or may not have insight into the unreal nature of the perception. [1]

• MB27.3 Disturbance of body image

  Excessively negative, distorted, or inaccurate perception of one's own body or parts of it. [1]

• MB27.4 Illusions

  A misinterpretation of a true sensation (e.g., hearing voices in the sound of running water, the perception of figures in shadows). [1]

Coded elsewhere

• disturbances of skin sensation (MB40.5)

References

1. World Health Organization. International Classification of Diseases, 11th Revision, for Mortality and Morbidity Statistics (ICD-11 MMS), 2026-01 release. World Health Organization; 2026.

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