ICD-10-CM
ICD-10 code for Fever: R50.9
The ICD-10-CM index points "Fever" to R50 (Fever of other and unknown origin), a header that is not billable. When nothing more specific is documented, the billable code is R50.9, Fever, unspecified.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
- A23.1abortus, Brucellosis due to Brucella abortusBillable
- A90Aden (dengue), Dengue fever [classical dengue]Billable
- A77.8African tick bite, Other spotted feversBillable
- A68.1African tick-borne, Tick-borne relapsing feverBillable
- B08.8aphthous, Other specified viral infections characterized by skin and mucous membrane lesionsBillable
- A94arbovirus, arboviral, Unspecified arthropod-borne viral feverBillable
- A96.0Argentinian hemorrhagic, Junin hemorrhagic feverBillable
- B55.0Assam, Visceral leishmaniasisBillable
- A78Australian Q, Q feverBillable
- A91Bangkok hemorrhagic, Dengue hemorrhagic feverBillable
- A92.8Barmah forest, Other specified mosquito-borne viral feversBillable
- A44.0Bartonella, Systemic bartonellosisBillable
- B50.8bilious, hemoglobinuric, Other severe and complicated Plasmodium falciparum malariaBillable
- B50.8blackwater, Other severe and complicated Plasmodium falciparum malariaBillable
- B00.1blister, Herpesviral vesicular dermatitisBillable
- A96.1Bolivian hemorrhagic, Machupo hemorrhagic feverBillable
- T73.3Bonvale dam, Exhaustion due to excessive exertionHeader
- A77.1boutonneuse, Spotted fever due to Rickettsia conoriiBillable
- A48.4Brazilian purpuric, Brazilian purpuric feverBillable
- A90breakbone, Dengue fever [classical dengue]Billable
- A77.0Bullis, Spotted fever due to Rickettsia rickettsiiBillable
- A92.8Bunyamwera, Other specified mosquito-borne viral feversBillable
- B55.0Burdwan, Visceral leishmaniasisBillable
- A92.8Bwamba, Other specified mosquito-borne viral feversBillable
- A75.9Canton, Typhus fever, unspecifiedBillable
- J00catarrhal (acute), Acute nasopharyngitis [common cold]Billable
- A28.1cat-scratch, Cat-scratch diseaseBillable
- A98.0Central Asian hemorrhagic, Crimean-Congo hemorrhagic feverBillable
- A39.0cerebrospinal meningococcal, Meningococcal meningitisBillable
- B50.9Chagres, Plasmodium falciparum malaria, unspecifiedBillable
- A92.8Chandipura, Other specified mosquito-borne viral feversBillable
- A93.1Changuinola, Sandfly feverBillable
- A92.0Chikungunya (viral) (hemorrhagic), Chikungunya virus diseaseBillable
- A93.1Chitral, Sandfly feverBillable
- A93.2Colorado tick (virus), Colorado tick feverBillable
- A98.0Congo virus, Crimean-Congo hemorrhagic feverBillable
- B50.9continued malarial, Plasmodium falciparum malaria, unspecifiedBillable
- A98.0Crimean-Congo hemorrhagic, Crimean-Congo hemorrhagic feverBillable
- A90dandy, Dengue fever [classical dengue]Billable
- A90dengue (virus), Dengue fever [classical dengue]Billable
More specific codes in R50
A header groups codes and is not billed. A billable code is one you can report.
- R50Fever of other and unknown originHeader
- R50.2Drug induced feverBillable
- R50.8Other specified feverHeader
- R50.81Fever presenting with conditions classified elsewhereBillable
- R50.82Postprocedural feverBillable
- R50.83Postvaccination feverBillable
- R50.84Febrile nonhemolytic transfusion reactionBillable
- R50.9Fever, unspecifiedBillable
Excludes1
Excludes1 means these codes are not reported together.
From R50. A note on a category applies to every code under it.
Related conditions
Related pages
- R50.9 code detailsNotes, nearby codes, CMS-HCC group
- Category R50Every code under it
- Chapter 18Symptoms, signs and abnormal clinical findings
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Fever?
The ICD-10-CM index points "Fever" to R50 (Fever of other and unknown origin), a header that is not billable. When nothing more specific is documented, the billable code is R50.9, Fever, unspecified.
Is R50.9 billable?
Yes. R50.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to R50.9?
The CDC tabular list gives 7 Excludes1 notes (not coded together) for R50.9 and the categories above it. They are listed on this page.
What chapter is R50.9 in?
Chapter 18. Symptoms, signs and abnormal clinical findings.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.