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 | ✓ |
| R50.2 | Drug induced fever | ✓ |
| R50.8 | Other specified fever | — |
| R50.8 | Other specified fever | — |
| R50.9 | Fever, unspecified | ✓ |
| R50.9 | Fever, unspecified | ✓ |
| R50.81 | Fever presenting with conditions classified elsewhere | ✓ |
| R50.81 | Fever presenting with conditions classified elsewhere | ✓ |
| R50.82 | Postprocedural fever | ✓ |
| R50.82 | Postprocedural fever | ✓ |
| R50.83 | Postvaccination fever | ✓ |
| R50.83 | Postvaccination fever | ✓ |
| R50.84 | Febrile nonhemolytic transfusion reaction | ✓ |
| R50.84 | Febrile nonhemolytic transfusion reaction | ✓ |
Frequently asked questions
What is ICD-10-CM code R50?
R50 is an ICD-10-CM category covering Fever of other and unknown origin. It contains 14 more specific diagnosis codes, 12 of which are billable.
Is R50 a billable code?
No — R50 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example R50.2 — Drug induced fever). 12 of the 14 codes under R50 are billable.
What codes fall under R50?
R50 includes R50.2, R50.2, R50.8, R50.8, R50.9, plus 9 more. See the full list with descriptions and billable status above.
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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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