{"code":"R50.81","type":"code","title":"Fever presenting with conditions classified elsewhere","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":["underlying condition when associated fever is present, such as with:","leukemia (C91-C95)","neutropenia (D70.-)","sickle-cell disease (D57.-)"],"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)"],"excludes2":[],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"sibling_codes":["R50","R50.2","R50.8","R50.82","R50.83","R50.84","R50.9"],"inclusionTerms":[],"sibling_titles":{"code":"R50.9","title":"Fever, unspecified","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Fever presenting with conditions classified elsewhere is a billable ICD-10-CM diagnosis code (R50.81). Excludes1 (not coded here): 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). Code first: underlying condition when associated fever is present, such as with:; leukemia (C91-C95); neutropenia (D70.-); sickle-cell disease (D57.-).","officialDefinition":"Fever presenting with conditions classified elsewhere is a billable ICD-10-CM diagnosis code (R50.81). Excludes1 (not coded here): 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). Code first: underlying condition when associated fever is present, such as with:; leukemia (C91-C95); neutropenia (D70.-); sickle-cell disease (D57.-).","seventhCharacterInstructions":[],"workflowProtocols":[],"guidelines":{"whenToUse":[],"whenNotToUse":[],"commonBillingMistakes":[],"codeComparisons":[],"documentationChecklist":[]},"domainLandscape":{"summary":"Primary diagnostic domain and clinical landscape evaluation.","keyCategories":[],"diagnosticContinuum":"Progression continuum from acute presentation to resolution."},"children":[],"hierarchy":[],"relatedCodes":[],"relevantCPTCodes":[],"documentationTips":[],"caseStudies":[],"description":"","overview":""}