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Chapters ENES DE

21Symptoms, signs or clinical findings, not elsewhere classified
Mental or behavioural symptoms, signs or clinical findings
MB24Symptoms or signs involving mood or affect
MB24.6Disturbance of affect

MB24.62 category

Flat affect

Definition

Absence or near absence of any sign of affective expression.

Also indexed as

Flat affect

Nearby in Disturbance of affect

MB24.60Constricted affect
MB24.61Blunted affect
MB24.63Labile affect
MB24.64Inappropriate affect
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified

PreviousMB24.61 — Blunted affect NextMB24.63 — Labile affect

Browse ICD-11

01Certain infectious or parasitic diseases
02Neoplasms
03Diseases of the blood or blood-forming organs
04Diseases of the immune system
05Endocrine, nutritional or metabolic diseases
06Mental, behavioural or neurodevelopmental disorders
07Sleep-wake disorders
08Diseases of the nervous system
09Diseases of the visual system
10Diseases of the ear or mastoid process
11Diseases of the circulatory system
12Diseases of the respiratory system
13Diseases of the digestive system
14Diseases of the skin
15Diseases of the musculoskeletal system or connective tissue
16Diseases of the genitourinary system
17Conditions related to sexual health
18Pregnancy, childbirth or the puerperium
19Certain conditions originating in the perinatal period
20Developmental anomalies
21Symptoms, signs or clinical findings, not elsewhere classified
22Injury, poisoning or certain other consequences of external causes
23External causes of morbidity or mortality
24Factors influencing health status or contact with health services
25Codes for special purposes
26Supplementary Chapter Traditional Medicine Conditions
VSupplementary section for functioning assessment
XExtension Codes
MA00-MA1YSymptoms, signs or clinical findings of blood, blood-forming organs, or the immune system
MA50-MA6YSymptoms, signs or clinical findings of endocrine, nutritional or metabolic diseases
MA80-MB0YSymptoms, signs or clinical findings of speech, language or voice
MB20-MB2YMental or behavioural symptoms, signs or clinical findings
MB40-MB9YSymptoms, signs or clinical findings of the nervous system
MC10-MC2YSymptoms, signs or clinical findings of the visual system
MC40-MC6YSymptoms, signs or clinical findings of ear or mastoid process
MC80-MC9YSymptoms, signs or clinical findings of the circulatory system
MD10-MD6YSymptoms, signs or clinical findings of the respiratory system
7 more
MB20Symptoms, signs or clinical findings involving consciousness
MB21Symptoms, signs or clinical findings involving cognition
MB22Symptoms or signs involving motivation or energy
MB23Symptoms or signs involving appearance or behaviour
MB24Symptoms or signs involving mood or affect
MB25Symptoms or signs involving form of thought
MB26Symptoms or signs involving content of thought
MB27Symptoms or signs involving perceptual disturbance
MB28Symptoms or signs related to personality features
3 more
MB24.2Anhedonia
MB24.3Anxiety
MB24.4Apathy
MB24.5Depressed mood
MB24.6Disturbance of affect
MB24.7Dysphoria
MB24.8Elevated mood
MB24.9Euphoria
MB24.AFear
11 more
MB24.60Constricted affect
MB24.61Blunted affect
MB24.62Flat affect
MB24.63Labile affect
MB24.64Inappropriate affect
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified

International Classification of Diseases, Eleventh Revision (ICD-11), World Health Organization (WHO) 2019/2021, https://icd.who.int/browse11. Licensed under Creative Commons Attribution-NoDerivatives 3.0 IGO (CC BY-ND 3.0 IGO).

Release 2026-01. View this entity in the official WHO ICD-11 browser.

This page reproduces WHO classification content for reference. It is not medical advice and must not be used to diagnose or treat. For coding decisions, consult the official release and your national coding guidelines.

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