Urban yellow fever

This code signifies yellow fever acquired in an urban environment, characterized by fever, myalgia, headache, and potentially jaundice, hemorrhage, and organ failure. It is a severe viral hemorrhagic disease transmitted by Aedes aegypti mosquitoes.

Use this code when the patient's medical record explicitly documents a diagnosis of yellow fever and specifies that the infection was contracted in an urban area. Documentation should include clinical signs and symptoms consistent with yellow fever and, ideally, laboratory confirmation.

• Differentiate from sylvatic (jungle) yellow fever, which has a distinct ICD-9-CM code.
• Ensure documentation clearly specifies "urban" to support this particular code.
• Consider sequencing this code as the primary diagnosis if it is the reason for the encounter.