R50.9

Applicable To

• Fever NOS

• Fever of unknown origin [FUO]

• Fever with chills

• Fever with rigors

• Hyperpyrexia NOS

• Persistent fever

• Pyrexia NOS

Approximate Synonyms

• Febrile illness fever)

• Fever

• Fever of unknown origin

• Fever with chills

• Pyrexia of unknown origin

Clinical Information

• A disorder characterized by elevation of the body’s temperature above the upper limit of normal.

• 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

• A rise in body temperature above the normal, often as a response to infection. [goc:jl]

• Abnormal elevation of body temperature, usually as a result of a pathologic process.

• An abnormal elevation of body temperature, usually as a result of a pathologic process.

• An increase in body temperature above normal 98.6 degrees f), usually caused by disease.

• Fever in which the etiology cannot be ascertained.

• Fever: a documented body temperature higher than 38 degrees c., or 100.4 degrees f.

• The elevation of the body’s temperature above the upper limit of normal, usually taken as 37.7 degrees c.

Details

• R50.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

• The 2023 edition of ICD-10-CM R50.9 became effective on October 1, 2022.

• This is the American ICD-10-CM version of R50.9 – other international versions of ICD-10 R50.9 may differ.