Diagnosis Code: R50.9

Short Description: Fever, unspecified

Long Description: Fever, unspecified

The code R50.9 is VALID for claim submission

Code Classification:

• Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99)
  • General symptoms and signs (R50-R69)
    • Fever of other and unknown origin (R50)
      • R50.9 Fever, unspecified

Code Version: 2022 ICD-10-CM

Synonyms

• Acute rise of fever
• Aseptic fever
• Biphasic fever
• Biphasic fever
• Body temperature above reference range
• Central fever
• Chill
• Chronic fever
• Continuous fever
• Cough with fever
• Desquamation of skin following febrile illness
• Disorder characterized by fever
• Endocrine hyperthermia
• Exercise-induced malignant hyperthermia
• Factitious fever
• Falling phase of fever
• Febrile leukopenia
• Feeling feverish
• Fever
• Fever defervescence
• Fever due to infection
• Fever greater than 100.4 Fahrenheit
• Fever with chills
• Fever, diurnal variation
• Feverish cold
• Gradual fall of fever
• Gradual rise of fever
• Hyperpyrexia
• Hyperpyrexia
• Hyperpyrexia
• Hyperthermia
• Hyperthermia-hyperphagia-hypothyroidism syndrome
• Increased skin temperature
• Intermittent fever
• Irregular fever
• Low grade pyrexia
• Malignant hyperthermia
• Malignant hyperthermia
• Malignant hyperthermia
• Malignant hyperthermia with arthrogryposis and torticollis syndrome
• Myoclonus associated with fever
• Neurogenic hyperthermia
• Pel Ebstein fever
• Phase of fever - finding
• Phase of fever - finding
• Phase of fever - finding
• Phase of fever - finding
• Phase of fever - finding
• Phase of fever - finding
• Phase of fever - finding
• Plateau phase of fever
• Prolonged fever
• Pyrexia of unknown origin
• Pyrexia of unknown origin
• Pyrexia of unknown origin co-occurrent with human immunodeficiency virus infection
• Rapid fall of fever
• Remittent fever
• Reversed diurnal fever
• Rising phase of fever
• Severe fever with thrombocytopenia syndrome virus
• Shivering or rigors
• Skin peeling disorder
• Slightly remittent fever
• Spiking fever
• Staircase fever
• Sweating fever
• Swinging fever
• Viral fever

References to Index of Diseases and Injuries

The code R50.9 has the following ICD-10-CM references to the Index of Diseases and Injuries

• Inclusion Terms:
  • Fever NOS
  • Fever of unknown origin [FUO]
  • Fever with chills
  • Fever with rigors
  • Hyperpyrexia NOS
  • Persistent fever
  • Pyrexia NOS

Crosswalk Information

Similar Codes

This page was last updated on: 10/1/2023

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