Opisthorchiasis

This code represents an infection caused by liver flukes of the genus Opisthorchis, primarily Opisthorchis viverrini or Opisthorchis felineus. These parasites infest the bile ducts, gallbladder, and pancreatic ducts, leading to inflammation and potential long-term complications.

Use this code when documentation confirms a diagnosis of opisthorchiasis, typically through microscopic identification of Opisthorchis eggs in stool or duodenal aspirates, or serological testing. It is appropriate for both acute and chronic presentations of the infection.

• Specify the exact species of Opisthorchis if known and documented, though this code is general for the genus.
• Code any associated complications, such as cholangitis (K83.09), cholelithiasis (K80.-), or cholangiocarcinoma (C22.1), in addition to the parasitic infection.
• Ensure documentation clearly distinguishes from other trematode infections affecting the liver, such as fascioliasis (B66.1) or clonorchiasis (B66.3).