R50.9 ICD-10-CM Code: Fever, unspecified
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
R50.9Fever, unspecified
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where R50.9 sits
- 1
Chapter 18
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
- 2
Section
General symptoms and signs (R50-R69)
- 3
Category R50
Fever of other and unknown origin
- 4
Code R50.9
Fever, unspecified
Documentation details
Notes for this code
Inclusion terms
- Fever NOS
- Fever of unknown origin [FUO]
- Fever with chills
- Fever with rigors
- Hyperpyrexia NOS
- Persistent fever
- Pyrexia NOS
Code first
No “code first” instruction is listed for R50.9.
Use additional code
No “use additional code” instruction is listed for R50.9.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for R50.9.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for R50.9.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code R50.9 mean?
R50.9 is the FY 2027 U.S. ICD-10-CM code for “Fever, unspecified.”
Is R50.9 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, R50.9 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is R50.9 located in ICD-10-CM?
R50.9 is listed in Chapter 18, Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), within General symptoms and signs (R50-R69) (R50–R69), under category R50, Fever of other and unknown origin.
What coding notes are listed for R50.9?
Its listed inclusion terms are Fever NOS; Fever of unknown origin [FUO]; Fever with chills; Fever with rigors; Hyperpyrexia NOS; Persistent fever; Pyrexia NOS. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
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