Peripheral T-cell lymphoma, NEC, intra-abdominal lymph nodes

This code signifies a rare and aggressive type of non-Hodgkin lymphoma originating from mature T-cells, specifically when the disease primarily affects lymph nodes located within the abdominal cavity. It represents a diagnosis of peripheral T-cell lymphoma that does not fit into other more specific classifications, with a clear anatomical localization to the intra-abdominal region.

Apply this code when documentation confirms a diagnosis of peripheral T-cell lymphoma, explicitly stating "not elsewhere classified" or a similar phrase, and specifying involvement of intra-abdominal lymph nodes. This code is appropriate for cases where the primary site of involvement is within the abdomen, such as mesenteric, retroperitoneal, or para-aortic lymph nodes.

• Ensure the physician documentation clearly specifies "intra-abdominal lymph nodes" and "not elsewhere classified" for the peripheral T-cell lymphoma.
• Differentiate from other specified types of peripheral T-cell lymphoma (e.g., anaplastic large cell lymphoma) which have their own specific codes.
• Do not use this code if the lymphoma is primarily in extra-abdominal sites, even if there is some abdominal involvement; prioritize the primary site.