Oth mature T/NK-cell lymph, nodes of axilla and upper limb

This code signifies a diagnosis of a mature T-cell or NK-cell lymphoma that does not fit into other specific categories, specifically affecting the lymph nodes located in the axilla (armpit) and the upper limb. These are aggressive non-Hodgkin lymphomas originating from mature T-lymphocytes or natural killer cells.

Apply this code when documentation confirms a diagnosis of an "other specified" or "not otherwise specified" mature T/NK-cell lymphoma with primary or metastatic involvement of the axillary or upper limb lymph nodes. This code is appropriate when the specific subtype of mature T/NK-cell lymphoma is not precisely identified but its presence in these anatomical sites is confirmed.

• Ensure the pathology report explicitly states "other" or "unspecified" mature T/NK-cell lymphoma and specifies involvement of axillary or upper limb lymph nodes.
• Do not use this code if a more specific mature T/NK-cell lymphoma subtype (e.g., Anaplastic Large Cell Lymphoma, Peripheral T-cell Lymphoma, NOS) is documented.
• Sequence this code as the primary diagnosis when it represents the reason for the encounter or as a secondary diagnosis when it contributes to the patient's overall clinical picture.