Lassa fever

This code represents Lassa fever, an acute viral hemorrhagic illness caused by the Lassa virus. It is an endemic zoonotic disease in West Africa, characterized by fever, malaise, headache, and can progress to severe multi-organ involvement, including hemorrhage and shock.

Assign this code when documentation confirms a diagnosis of Lassa fever, typically based on clinical presentation, epidemiological links, and laboratory confirmation (e.g., PCR, serology). This code is appropriate for both confirmed and suspected cases where the clinical picture strongly indicates Lassa fever and further testing is underway or pending.

• Ensure documentation specifies "Lassa fever" to differentiate from other viral hemorrhagic fevers.
• Do not confuse with other viral hemorrhagic fevers like Ebola or Marburg; these have distinct ICD-10-CM codes.
• If Lassa fever leads to specific complications, sequence the Lassa fever code first, followed by codes for any associated manifestations or complications.