Patient presents with a viral exanthem, characterized by a diffuse maculopapular rash.  Onset of the rash was preceded by a prodrome of fever, malaise, and possibly upper respiratory symptoms such as rhinorrhea and cough.  Differential diagnosis includes measles, rubella, roseola infantum, fifth disease (erythema infectiosum), and other viral exanthems.  Physical examination reveals a blanching erythematous rash distributed over the trunk and extremities.  Lymphadenopathy may be present.  The patient's temperature is documented.  No signs of dehydration or respiratory distress are noted.  Diagnosis of viral exanthem is made clinically, based on the characteristic presentation and absence of other defining features suggestive of specific viral etiologies.  Laboratory testing is not routinely indicated for uncomplicated viral exanthems.  Treatment is supportive, focusing on symptomatic management of fever and pruritus with antipyretics such as acetaminophen or ibuprofen and oral antihistamines as needed.  Patient education provided regarding disease course, contagious period, and importance of hydration.  Follow-up is recommended if symptoms worsen or do not resolve within a typical timeframe.  ICD-10 code B08.9, Viral exanthem, unspecified, is appropriate for this encounter.  This diagnosis is often searched using terms such as childhood rash, viral rash, maculopapular rash, febrile rash, and exanthem diagnosis.