Mediastinal (thymic) large B-cell lymphoma, intra-abd nodes

This code represents a specific type of aggressive non-Hodgkin lymphoma originating from B-lymphocytes, primarily characterized by its mediastinal (thymic) origin, but with documented involvement of intra-abdominal lymph nodes. It is a distinct entity from diffuse large B-cell lymphoma (DLBCL) and often presents with a bulky mediastinal mass.

Use this code when the physician's documentation explicitly states a diagnosis of mediastinal (thymic) large B-cell lymphoma and confirms the presence of disease in intra-abdominal lymph nodes. This diagnosis is typically established through biopsy and immunohistochemical studies. Ensure the documentation clearly distinguishes this from other large B-cell lymphomas.

• Confirm the primary site is mediastinal (thymic) and that intra-abdominal lymph node involvement is specifically documented, not just generalized lymphadenopathy.
• Do not confuse this with other subtypes of diffuse large B-cell lymphoma (DLBCL) or primary mediastinal B-cell lymphoma without intra-abdominal spread.
• Always review pathology reports and physician notes for definitive diagnostic statements and precise anatomical involvement.