ICDwise
R50 ⚠ Non-billable

Fever of other and unknown origin

ICD-10-CM · FY2026 · Symptoms, Signs and Abnormal Clinical and Laboratory Findings

Code
R50
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Symptoms, Signs and Abnormal Clinical and Laboratory Findings
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Official coding notes

From CMS's ICD-10-CM Tabular List.

Excludes1 — never code together
  • 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?
ICD-10-CM code R50 represents Fever of other and unknown origin. It is a non-billable header code requiring a more specific subcategory in the Symptoms, Signs and Abnormal Clinical and Laboratory Findings chapter, effective October 1, 2025 – September 30, 2026.
Is R50 billable?
No. R50 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is R50 in?
R50 belongs to the Symptoms, Signs and Abnormal Clinical and Laboratory Findings chapter (R00–R99) of ICD-10-CM.

Related codes in the R50 category

R50.2 Drug induced fever Billable R50.8 Other specified fever Non-billable R50.9 Fever, unspecified Billable R50.81 Fever presenting with conditions classified elsewhere Billable R50.82 Postprocedural fever Billable R50.83 Postvaccination fever Billable R50.84 Febrile nonhemolytic transfusion reaction Billable

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