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Chapters ENES DE

XExtension Codes
Severity Scale Value
Generic Severity Scale Value
Phase Scale Value

XS21 category

Phase 4

Also indexed as

Phase 4

Nearby in Phase Scale Value

XS4APhase 0
XS3KPhase 1
XS4MPhase 2
XS8VPhase 3
XS8ZPhase 5
XS41Phase 6
XS73Phase 7
XS9ZPhase 8

PreviousXS8V — Phase 3 NextXS8Z — Phase 5

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
Severity Scale Value
Temporality
Aetiology
Topology Scale Value
Anatomy and topography
Histopathology
Dimensions of injury
Dimensions of external causes
Consciousness
5 more
Generic Severity Scale Value
Disease Specific Severity Scale Value
Basic 3-Value Severity Scale Value: Mild-Moderate-Severe
Clinical Severity Scale Value: Stage 1-2-3-4
Clinical Severity Scale Value: Stage 1-2-2a-2b-3-4
Mild Moderate Severe Scale Value
Clinical Staging Scale Value
Grading Scale Value
Phase Scale Value
Problem Scale Value
Other severity scale value
XS4APhase 0
XS3KPhase 1
XS4MPhase 2
XS8VPhase 3
XS21Phase 4
XS8ZPhase 5
XS41Phase 6
XS73Phase 7
XS9ZPhase 8
XS83Phase 9
XS47Phase 10

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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