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ICD-10 diagnosis code

R50.9 Fever, unspecified

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R50.9 is the ICD-10 code for Fever, unspecified. It is a four-character subcategory of R50 (Fever of other and unknown origin), the most specific level in the WHO edition. It belongs to the block R50–R69 (General symptoms and signs) in Chapter XVIII, Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

Code type
Subcategory (4 characters)
Chapter
XVIII · R00–R99
Classification
WHO ICD-10, 2019 version

What R50.9 includes

Conditions and terms that are coded here.

  • Hyperpyrexia NOS
  • Pyrexia NOS

What R50.9 excludes

Conditions that look similar but belong under another code.

  • malignant hyperthermia due to anaesthesia T88.3

R50.9 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

R50.9Feber, ospecificerad

NorwayICD-10-NO

R50.9Uspesifisert feber

DenmarkICD-10-DK

DR509Feber UNS

FinlandICD-10-FI

R50.9Määrittämätön kuume

GermanyICD-10-GM

R50.9Fieber, nicht näher bezeichnet

FranceICD-10-FR

R50.9Fièvre, sans précision

NetherlandsICD-10-NL

R50.9koorts, niet-gespecificeerd

United StatesICD-10-CM

R50.9Fever, unspecified

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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