MG26 Fever of other or unknown origin

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2025-01

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

exclusions

• fever of unknown origin in newborn  (KD10-KD1Z)
• Malignant hyperthermia due to anaesthesia  (NE86)

code elsewhere

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

postcoordination

synonyms

• Fever of other or unknown origin
• febrile
• febris
• fever
• feverish
• high body temperature
• hyperthermia
• hyperthermic
• increased body temperature
• pyrexia
• fever NOS
• raised body temperature
• Pyrexia NOS
• ephemeral fever
• elevated body temperature
• FUO - [fever of unknown origin]
• hyperpyrexia
• Hyperpyrexia NOS
• hyperpyrexia of unknown origin
• malignant hyperthermia
• PUO - [pyrexia of unknown origin]
• fever, unspecified
• intermittent fever of unknown origin
• 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

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