ICD-10-CM Book 2024 Edition

Chapters  /  Chapter 18  /  R50-R69  /  R50
R50 Fever of other and unknown origin
Excludes1 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
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
Excludes1 postvaccination (postimmunization) fever (R50.83)
R50.8 Other specified fever
R50.81 Fever presenting with conditions classified elsewhere
CodeFirst underlying condition when associated fever is present, such as with:
leukemia (C91-C95)
neutropenia (D70.-)
sickle-cell disease (D57.-)
nonPrimary Yes
R50.82 Postprocedural fever
Excludes1 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