Kaposi's sarcoma, unspecified

This code identifies a malignant vascular tumor that arises from endothelial cells, characterized by purple, red, or brown lesions on the skin, mucous membranes, lymph nodes, or internal organs. It is associated with human herpesvirus 8 (HHV-8) infection and commonly seen in immunocompromised individuals, particularly those with HIV/AIDS.

Assign this code when the medical record documents a diagnosis of Kaposi's sarcoma without specifying the anatomical site. This is appropriate when the physician's documentation does not provide sufficient detail to code to a more specific anatomical location (e.g., skin, gastrointestinal, lung).

• Always attempt to code to a more specific anatomical site if documented (e.g., C46.0 for skin, C46.1 for soft tissue).
• Remember to code any associated HIV infection (B20) if present, as Kaposi's sarcoma is an AIDS-defining illness.
• Review the pathology report and physician notes for precise location to avoid using this unspecified code.