Mature T/NK-cell lymphomas, unsp, intra-abd lymph nodes

This code identifies a malignant neoplasm originating from mature T-cells or natural killer (NK) cells, specifically when the primary or most significant involvement is within the intra-abdominal lymph nodes. This is a broad category of non-Hodgkin lymphomas characterized by the proliferation of these specific lymphocyte types.

Use this code when documentation confirms a diagnosis of mature T-cell or NK-cell lymphoma, and imaging or pathology reports specify involvement of intra-abdominal lymph nodes without further histological subtyping. This code is appropriate when the specific subtype of mature T/NK-cell lymphoma is not yet determined or documented.

• Do not use this code if a more specific subtype of mature T/NK-cell lymphoma (e.g., anaplastic large cell lymphoma, peripheral T-cell lymphoma, NOS) is documented.
• Ensure documentation clearly indicates intra-abdominal lymph node involvement; otherwise, a more general site code may be appropriate.
• Sequence this code as the primary diagnosis when it is the reason for the encounter or hospitalization.