ICD-10 Diagnosis Code R50.9

Fever, unspecified

Diagnosis Code R50.9

ICD-10: R50.9
Short Description: Fever, unspecified
Long Description: Fever, unspecified
This is the 2018 version of the ICD-10-CM diagnosis code R50.9

Valid for Submission
The code R50.9 is valid for submission for HIPAA-covered transactions.

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)

Information for Medical Professionals

According to ICD-10-CM guidelines this code should not to be used as a principal diagnosis code when a related definitive diagnosis has been established.
Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Abnormal gamma globulin level
  • Acute rise of fever
  • Acute rise of fever
  • Aseptic fever
  • Biphasic fever
  • Biphasic fever
  • Body temperature above reference range
  • Central fever
  • Chill
  • Chronic fever
  • Continuous fever
  • Continuous fever
  • Continuous fever
  • Cough with fever
  • Desquamation of skin following febrile illness
  • Endocrine hyperthermia
  • Factitious fever
  • Falling phase of fever
  • Falling phase of fever
  • Falling phase of fever
  • Falling phase of fever
  • Febrile disorder
  • Feels hot/feverish
  • Fever
  • Fever defervescence
  • Fever greater than 100.4 Fahrenheit
  • Fever with chills
  • Fever, diurnal variation
  • Fever, diurnal variation
  • Feverish cold
  • Finding of temperature of skin
  • Gradual fall of fever
  • Gradual rise of fever
  • Gradual rise of fever
  • Humoral immune defect
  • Hyperimmunoglobulin D with periodic fever
  • Hyperpyrexia
  • Hyperthermia-hyperphagia-hypothyroidism syndrome
  • Increased skin temperature
  • Intermittent fever
  • Intermittent fever
  • Irregular fever
  • Irregular fever
  • Low grade pyrexia
  • Myoclonus associated with fever
  • Neurogenic hyperthermia
  • On examination - character of fever
  • On examination - character of fever
  • On examination - character of fever
  • On examination - character of fever
  • On examination - fever
  • On examination - fever - acute rise
  • On examination - fever - continuous
  • On examination - fever - fast fall-crisis
  • On examination - fever - general
  • On examination - fever - gradual rise
  • On examination - fever - intermittent
  • On examination - fever - irregular
  • On examination - fever - remittent
  • On examination - fever-gradual fall-lysis
  • On examination - hyperpyrexia
  • On examination - hyperpyrexia - greater than 40.5 degrees Celsius
  • On examination - level of fever
  • On examination - pyrexia of unknown origin
  • On examination - staircase fever
  • On examination - temperature elevated
  • Pel Ebstein fever
  • Plateau phase of fever
  • Prolonged fever
  • Pyrexia of unknown origin
  • Pyrexia of unknown origin
  • Pyrexia of unknown origin
  • Pyrexia of unknown origin co-occurrent with human immunodeficiency virus infection
  • Rapid fall of fever
  • Rapid fall of fever
  • Remittent fever
  • Remittent fever
  • Remittent fever
  • Reversed diurnal fever
  • Rising phase of fever
  • Rising phase of fever
  • Rising phase of fever
  • Selective immunoglobulin dysfunction
  • Skin peeling disorder
  • Slightly remittent fever
  • Spiking fever
  • Staircase fever
  • Sweating fever
  • Swinging fever

Index of Diseases and Injuries
References found for the code R50.9 in the Index of Diseases and Injuries:

Information for Patients


Also called: Pyrexia

A fever is a body temperature that is higher than normal. It is not an illness. It is part of your body's defense against infection. Most bacteria and viruses that cause infections do well at the body's normal temperature (98.6 F). A slight fever can make it harder for them to survive. Fever also activates your body's immune system.

Infections cause most fevers. There can be many other causes, including

  • Medicines
  • Heat exhaustion
  • Cancers
  • Autoimmune diseases

Treatment depends on the cause of your fever. Your health care provider may recommend using over-the-counter medicines such as acetaminophen or ibuprofen to lower a very high fever. Adults can also take aspirin, but children with fevers should not take aspirin. It is also important to drink enough liquids to prevent dehydration.

  • Familial Mediterranean fever (Medical Encyclopedia)
  • Fever (Medical Encyclopedia)
  • When your baby or infant has a fever (Medical Encyclopedia)

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