MG26

ICD-11 MMS 2026-01

Fever of other or unknown origin

Description

An abnormal elevation of body temperature of unknown origin, often as a result of a pathologic process.

Index terms

  • Fever of other or unknown origin
  • FUO - [fever of unknown origin]
  • Hyperpyrexia NOS
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  • PUO - [pyrexia of unknown origin]
  • Pyrexia NOS
  • elevated body temperature
  • ephemeral fever
  • febrile
  • febris
  • fever
  • fever NOS
  • fever, unspecified
  • feverish
  • high body temperature
  • hyperpyrexia
  • hyperpyrexia of unknown origin
  • hyperthermia
  • hyperthermic
  • increased body temperature
  • intermittent fever of unknown origin
  • malignant hyperthermia
  • pyrexia
  • raised body temperature
  • Central fever
  • Drug-induced fever
  • drug fever
  • medicament-induced fever
  • Acute febrile syndrome
  • Other specified fever
  • Fever with chills
  • Fever with rigors
  • Persistent fever
  • persistent pyrexia

Excludes

  • http://id.who.int/icd/entity/1319339568 – fever of unknown origin in newborn
  • NE86 – Malignant hyperthermia due to anaesthesia

Exclusions from above levels

  • 19 – Certain conditions originating in the perinatal period
  • JA66 – Clinical findings on antenatal screening of mother

Foundation children elsewhere

  • JB0D.2 – Pyrexia during labour, not elsewhere classified
  • JB40.4 – Pyrexia of unknown origin following delivery
  • KD11 – Fever of newborn

Sibling codes

  • MG20 – Cachexia
  • MG21 – Chills
  • MG22 – Fatigue
  • MG23 – Fear of death or dying
  • MG24 – Fear of disease
  • MG25 – Feeling ill
  • MG27 – Haemorrhage, not elsewhere classified
  • MG28 – Hypothermia, not associated with low environmental temperature
  • MG29 – Oedema
  • MG2A – Ageing associated decline in intrinsic capacity
  • MG40 – Shock
  • MG41 – Sleep disturbance, not elsewhere classified
  • MG42 – Somnolence, not elsewhere classified
  • MG43 – Symptoms or signs concerning food or fluid intake
  • MG44 – Symptoms peculiar to infancy
  • MG45 – Syncope or collapse
  • MG46 – Systemic inflammatory response syndrome of noninfectious origin
  • MG47 – Toxicosis not further specified
  • MG48 – Unknown or unspecified causes of morbidity
  • MG49 – Hangover
  • MG4A – Multi organ failure
  • MG4Y – Other specified general symptoms

Foundation entity

Fever of other or unknown origin – http://id.who.int/icd/entity/915343154

Allowed postcoordination axes

Part of: 21: Symptoms, signs or clinical findings, not elsewhere classified