Mature T/NK-cell lymph, unsp, nodes of axilla and upper limb

This code signifies a diagnosis of mature T-cell or NK-cell lymphoma, where the specific subtype of lymphoma is not documented or is unknown. The primary site of involvement for this lymphoma is explicitly located in the lymph nodes of the axilla (armpit) and/or the upper limb.

Use this code when the physician's documentation confirms a diagnosis of mature T/NK-cell lymphoma, but the specific type (e.g., peripheral T-cell lymphoma, anaplastic large cell lymphoma) is not specified. This code is appropriate when the lymphoma is definitively localized to the axillary or upper limb lymph nodes, and no other primary site is identified.

• Ensure documentation clearly states "unspecified" or lacks further specificity regarding the mature T/NK-cell lymphoma subtype.
• Verify that the anatomical site is explicitly documented as lymph nodes of the axilla and/or upper limb.
• Do not use this code if a more specific subtype of mature T/NK-cell lymphoma is identified; instead, code to the specific type and site.