Lymphoblastic (diffuse) lymphoma, unspecified site

This code represents a malignant neoplasm of the lymphatic system characterized by the rapid proliferation of immature lymphocytes (lymphoblasts). It is a highly aggressive form of non-Hodgkin lymphoma, often presenting with widespread disease. The "diffuse" aspect indicates that the cancerous cells are spread throughout the affected lymph nodes or organs rather than forming distinct nodules.

This code is appropriate for cases of lymphoblastic lymphoma where the specific anatomical site of the primary tumor or involved lymph nodes is not documented or is unknown. It is used when the pathology report confirms lymphoblastic lymphoma but lacks further site specificity. Documentation should clearly state "lymphoblastic lymphoma, diffuse" without a specified location.

• Avoid using this code if a specific anatomical site (e.g., mediastinal, cutaneous) is documented; instead, use a more precise C83.5- subcategory.
• Always review the pathology report for definitive diagnosis and site information.
• Consider sequencing this code as the primary diagnosis when the patient is receiving treatment specifically for this condition.