R50 – Fever of other and unknown origin

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

Non-billable header

ICD-10-CM code R50
Code
R50 (claims format: R50)
Description
Fever of other and unknown origin
Billable
No – use a more specific code below
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

Billable codes under R50

R50 is a header code and cannot be used on claims. Choose the most specific code:

Notes for R50

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)

Frequently asked questions

What is ICD-10 code R50?

R50 is the ICD-10-CM code for fever of other and unknown origin, in the block R50-R69 (General symptoms and signs).

Is R50 a billable code?

No. R50 is a header code with more specific child codes; report one of the billable codes listed above.

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.