R50.9 — Fever, unspecified

R50.9

ICD-10 Chapter 18: Symptoms, Signs & Abnormal Findings — illustrative image — Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99) — illustrative image

What this code means

Fever is a raised body temperature, usually above 38°C, recorded when the cause is not yet specified.

Also called: fever, pyrexia, raised temperature.

When this code is used

Used for fever, unspecified.

Where it sits in ICD-10-CM

Code R50.9 belongs to Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified, which covers codes R00–R99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related symptoms

Fever

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Frequently asked questions

What is ICD-10-CM code R50.9?

R50.9 is the ICD-10-CM diagnosis code for “Fever, unspecified”. Fever is a raised body temperature, usually above 38°C, recorded when the cause is not yet specified.

When is code R50.9 used?

Used for fever, unspecified. It belongs to Chapter 18 of ICD-10-CM (Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.