Anaplastic large cell lymphoma, ALK-pos, intra-abd nodes

This code identifies a specific type of non-Hodgkin lymphoma characterized by anaplastic large cells that test positive for anaplastic lymphoma kinase (ALK) protein, specifically when the disease is located within the intra-abdominal lymph nodes. It represents a distinct molecular and anatomical subtype of anaplastic large cell lymphoma.

Assign this code when documentation confirms a diagnosis of ALK-positive anaplastic large cell lymphoma with primary or metastatic involvement of lymph nodes within the abdominal cavity. Pathological reports confirming ALK positivity and imaging/biopsy reports specifying intra-abdominal lymph node involvement are essential for accurate coding.

• Ensure the pathology report explicitly states "ALK-positive" for anaplastic large cell lymphoma.
• Verify the anatomical site is specifically "intra-abdominal lymph nodes" and not other sites.
• Do not confuse with ALK-negative anaplastic large cell lymphoma or other types of lymphoma affecting abdominal lymph nodes.