R50 - Fever of other and unknown origin
Excludes 1:
-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)
R50.2 - Drug induced fever
R50.8 - Other specified fever
R50.81 - Fever presenting with conditions classified elsewhere
R50.82 - Postprocedural fever
R50.83 - Postvaccination fever
R50.84 - Febrile nonhemolytic transfusion reaction
R50.9 - Fever, unspecified