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R50

Fever of other and unknown origin

• 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

• postvaccination (postimmunization) fever (R50.83)

R50.8

Other specified fever

R50.81

Fever presenting with conditions classified elsewhere

R50.82

Postprocedural fever

• postprocedural infection (T81.4-)
• posttransfusion fever (R50.84)
• postvaccination (postimmunization) fever (R50.83)

R50.83

Postvaccination fever

• Postimmunization fever

R50.84

Febrile nonhemolytic transfusion reaction

• FNHTR
• Posttransfusion fever

R50.9

Fever, unspecified

• Fever NOS
• Fever of unknown origin [FUO]
• Fever with chills
• Fever with rigors
• Hyperpyrexia NOS
• Persistent fever
• Pyrexia NOS