R50: Fever of other and unknown origin

Codes under R50 (Fever of other and unknown origin). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

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

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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