ICD-10-CM > R00-R99 > R50-R69 > R50 > R50.8 R50.8 Other specified fever Non-Billable/Non-Specific Codes R50.81Fever presenting with conditions classified elsewhereR50.82Postprocedural feverR50.83Postvaccination feverR50.84Febrile nonhemolytic transfusion reaction