ICD-10-CM › R00-R99 › R50-R69 › R50 Fever of other and unknown origin › R50.9
Fever, unspecified
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Fever, unspecified
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from R50 Fever of other and unknown origin
Excludes1 - never 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)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Raised
- Hyperthermia
- Febris, febrile
- Fever > viral hemorrhagic
- FUO
- PUO
- Fever
- Pyrexia
- Hyperpyrexia
- Fever > ephemeral
- Inanition > fever
- Chill > with fever
- Fever > persistent
- High > temperature
- Rigors > with fever
- Pyrexia > persistent
- Fever > unknown origin
- Temperature > body, high
- Hyperpyrexia > unknown origin
- Elevated, elevation > body temperature
- Fever > intermittent > of unknown origin
Codes in the same group
| Code | Description | Status |
|---|---|---|
| R50.2 | Drug induced fever | Valid |
| R50.8 | Other specified fever | Not billable |