R50.9 – Fever, unspecified

ICD-10-CM 2027 diagnosis code · General symptoms and signs

Billable code

ICD-10-CM code R50.9

Code: R50.9 (claims format: R509)
Description: Fever, unspecified
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 18. Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
Block: R50-R69 General symptoms and signs
Parent codes: R50

Notes for R50.9

Applicable to:

Fever NOS
Fever of unknown origin [FUO]
Fever with chills
Fever with rigors
Hyperpyrexia NOS
Persistent fever
Pyrexia NOS

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

R50 – Fever of other and unknown origin

Excludes1 (not coded here):

chills without fever (R68.83)
febrile convulsions (R56.0-)
fever of unknown origin during labor (O75.2)
fever of unknown origin in newborn (P81.9)
hypothermia due to illness (R68.0)
malignant hyperthermia due to anesthesia (T88.3)
puerperal pyrexia NOS (O86.4)

Index terms for R50.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in R50

R50.2 – Drug induced feverBillable
R50.8 – Other specified feverHeader

Frequently asked questions

What is ICD-10 code R50.9?

R50.9 is the ICD-10-CM code for fever, unspecified, in the block R50-R69 (General symptoms and signs).

Is R50.9 a billable code?

Yes. R50.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does R50.9 belong to?

It belongs to category R50 – Fever of other and unknown origin.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.