R50.9 - Fever, unspecified
- Applicable to Fever, unspecified
- The 2025 edition of ICD10-CM R50.9 became effective on October 1, 2024.
- This is the American ICD10-CM version of R50.9 - other international versions of ICD10 R50.9 may differ.
- R50.9 is a Billable / Specific ICD10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Inclusion Term
- Fever NOS
- Fever of unknown origin [FUO]
- Fever with chills
- Fever with rigors
- Hyperpyrexia NOS
- Persistent fever
- Pyrexia NOS
The following codes above R50.9 contain annotation back-references that may be applicable to R50.9:
Chapter: R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Section: R50-R69 General symptoms and signs
Category: R50 Fever of other and unknown origin
Billable/Specific Code
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Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
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