Kaposi's sarcoma of unspecified lung

This code represents a malignant neoplasm characterized by the proliferation of endothelial cells, specifically affecting the lung tissue, where the laterality (left or right) is not specified in the medical record. Kaposi's sarcoma is often associated with human herpesvirus 8 (HHV-8) infection and frequently seen in immunocompromised individuals, such as those with HIV/AIDS.

Use this code when documentation confirms a diagnosis of Kaposi's sarcoma involving the lung, but the physician's notes do not specify whether it is in the left or right lung. This diagnosis is typically made via biopsy and histopathological examination. Supporting documentation would include pathology reports, imaging studies (e.g., CT scan showing lung lesions), and clinical notes detailing the diagnosis.

• Do not use this code if the laterality of the lung involvement is documented; instead, choose C46.51 (right lung) or C46.52 (left lung).
• Always code the underlying cause, such as HIV infection (B20), if applicable, as a primary diagnosis when present.
• Ensure the documentation clearly states "Kaposi's sarcoma" and specifies lung involvement to support this code.