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R50

Non-billable

Fever of other and unknown origin

R50 is the ICD-10-CM code for Fever of other and unknown origin. It is a non-billable category code — use a more specific child code such as R50.2 for billing.

Status
Header (non-billable)
Chapter
R00-R99
Subcodes
3
Edition
FY2026

R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

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". It falls under R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
Is R50 a billable code?
No — R50 is a non-billable header code. Use a more specific child code (such as R50.2) for billing.
What are the subcodes of R50?
R50 has 3 more specific child codes, including R50.2, R50.8, R50.9.
What is excluded from 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).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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