Oncovirus as the cause of diseases classified elsewhere

This code identifies a viral infection caused by an oncovirus that is responsible for a disease classified in another chapter of ICD-10-CM. Oncoviruses are viruses known to induce tumor formation, and this code specifically indicates their etiologic role in a separate, primary diagnosis.

Assign this code as an additional diagnosis when documentation clearly links an oncoviral infection as the underlying cause of a neoplastic or other specified disease. This is typically used in conjunction with a code for the specific malignancy or condition caused by the oncovirus, such as certain lymphomas, leukemias, or carcinomas.

• Always sequence this code after the primary diagnosis it is causing.
• Ensure documentation explicitly states the oncovirus as the causative agent, not merely a co-occurring infection.
• Do not use this code for oncoviral infections that are not explicitly linked to another disease classified elsewhere.