Isosporiasis

This code represents an infection of the intestinal tract caused by the parasite Cystoisospora belli (formerly Isospora belli). It typically manifests as acute or chronic diarrhea, abdominal pain, and malabsorption, particularly in immunocompromised individuals.

Assign this code when documentation confirms a diagnosis of isosporiasis, often through microscopic identification of oocysts in stool samples. It is frequently seen in patients with HIV/AIDS or other conditions causing immunosuppression.

• Ensure the documentation specifies Cystoisospora belli to differentiate from other parasitic infections.
• Consider co-occurring conditions, such as HIV, and code them appropriately as secondary diagnoses.
• Do not confuse with cryptosporidiosis or giardiasis, which are distinct parasitic infections.