R50.9
R50.9: Fever, unspecified
Billable / specific codeICD-10-CM
R50.9 is a billable, specific ICD-10-CM code for fever, unspecified. It is valid for submission on a claim.
Check R50.9 with the rest of the claim: free scrubberInclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Fever NOS
- Fever of unknown origin [FUO]
- Fever with chills
- Fever with rigors
- Hyperpyrexia NOS
- Persistent fever
- Pyrexia NOS
Excludes1 inherited from the categories above R50.9
A category’s note binds every code beneath it.
Written on R50: Fever of other and unknown origin
Other codes that can never be billed with R50.9
Their own Excludes1 notes name this code, so the conflict is not listed above.
- R68.83Chills (without fever)
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
R50.9 is named in 14 Medicare coverage policies: 14 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A55326Billing and Coding: Zika Virus Testing by PCR and ELISA Methods
- A56421Billing and Coding: CT of the Abdomen and Pelvis
- A56476Billing and Coding: Cardiac Radionuclide Imaging
- A56625Billing and Coding: Echocardiography
Alphabetic index entries that lead here
- Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)
- FUO(fever of unknown origin)
- Hyperpyrexia
- PUO(pyrexia of unknown origin)
- Pyrexia(of unknown origin)
- Chill›with fever
- Elevated, elevation›body temperature(of unknown origin)
- Fever›ephemeral(of unknown origin)
- Fever›persistent(of unknown origin)
- Fever›unknown origin
- High›temperature(of unknown origin)
- Hyperpyrexia›unknown origin
Code history
Unchanged in every release from FY2024 to FY2027.