Lymphoblastic (diffuse) lymphoma, intrapelvic lymph nodes

This code signifies a malignant neoplasm characterized by the rapid proliferation of immature lymphoid cells, specifically located within the lymph nodes of the intrapelvic region. It represents a high-grade, aggressive form of non-Hodgkin lymphoma originating from B-cell or T-cell precursors.

Apply this code when documentation confirms a diagnosis of lymphoblastic lymphoma with primary or metastatic involvement of lymph nodes situated within the true pelvis. This typically includes findings from biopsy, imaging (e.g., CT, MRI, PET scans), and pathology reports specifying the intrapelvic location.

• Ensure the pathology report explicitly states "lymphoblastic lymphoma" and confirms involvement of intrapelvic lymph nodes.
• Do not use this code for lymphoblastic leukemia, even if lymph nodes are involved; a separate code exists for leukemia.
• Sequence this code as the primary diagnosis when the lymphoma is the reason for the encounter or treatment.