Schistosomiasis due to Schistosoma japonicum

This code identifies an infection caused by the parasitic flatworm Schistosoma japonicum, commonly known as Oriental schistosomiasis or Katayama fever. This helminthic infection primarily affects the liver and intestines, leading to symptoms such as fever, abdominal pain, diarrhea, and hepatosplenomegaly. Chronic infection can result in severe organ damage, including liver fibrosis and portal hypertension.

Assign this code when documentation confirms a diagnosis of schistosomiasis specifically attributed to Schistosoma japonicum. This typically occurs in patients with a history of exposure in endemic regions (e.g., East Asia) and positive diagnostic tests such as stool microscopy for ova, serology, or PCR. Use this code for both acute and chronic manifestations of the infection.

• Ensure the specific species japonicum is documented; do not use for other schistosoma species.
• Code any associated organ manifestations (e.g., hepatic fibrosis, portal hypertension) separately as secondary diagnoses.
• Differentiate from unspecified schistosomiasis (B65.9) or schistosomiasis due to other specified species.