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Chapters ENES DE

XExtension Codes
Dimensions of external causes
Aspects of incidents related to devices
XE52XChemical problem
XE3E0Device ingredient or reagent problem

XE657 category

Low pH

Definition

pH lower than expected and / or anticipated.

Also indexed as

Low pH

Nearby in Device ingredient or reagent problem

XE4BCClumping in device or device ingredient
XE49WCoagulation in device or device ingredient
XE4VPPrecipitate in device or device ingredient
XE8Z6Cross reactivity
XE0VBParticulates
XE0K7High pH

PreviousXE0K7 — High pH

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
Topology Scale Value
Anatomy and topography
Histopathology
Dimensions of injury
Dimensions of external causes
Consciousness
Substances
Diagnosis code descriptors
Capacity or context
5 more
Aspects of assault and maltreatment
Aspects of intentional self-harm events
Aspects of armed conflict
Type of legal intervention
Aspects of incidents related to devices
Investigation conclusion of events related to devices
Findings of investigations related to devices
Cause investigation and type of investigation
Medical device component
11 more
XE4HKPatient device interaction problem
XE7Q8Manufacturing, packaging or shipping problem
XE52XChemical problem
XE4LPMaterial integrity problem
XE2GFMechanical problem
XE941Optical problem
XE28YOutput problem
XE16CElectrical or electronic property problem
XE55UCalibration problem
17 more
XE9ACDevice emits odour
XE3E0Device ingredient or reagent problem
XE6E7Improper chemical reaction
XE4BCClumping in device or device ingredient
XE49WCoagulation in device or device ingredient
XE4VPPrecipitate in device or device ingredient
XE8Z6Cross reactivity
XE0VBParticulates
XE0K7High pH
XE657Low pH

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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