Mature T/NK-cell lymphomas, unsp, lymph nodes mult site

This code signifies a diagnosis of mature T-cell or natural killer (NK)-cell lymphoma where the specific subtype of lymphoma is not documented, and the disease affects lymph nodes in multiple, non-contiguous anatomical regions. It indicates a disseminated form of these rare lymphoid malignancies without further pathological classification.

Use this code when the medical record clearly states a diagnosis of "mature T/NK-cell lymphoma" or "T/NK-cell lymphoma" without specifying a more definitive subtype (e.g., peripheral T-cell lymphoma, not otherwise specified; anaplastic large cell lymphoma). Documentation must also indicate involvement of lymph nodes in more than one body region, such as cervical and inguinal nodes, without further site specificity.

• Ensure the documentation explicitly states "unspecified" or "NOS" for the T/NK-cell lymphoma subtype.
• Confirm multiple lymph node sites are affected, but the specific sites are not detailed enough for a more precise code.
• Avoid using this code if a more specific mature T/NK-cell lymphoma subtype (e.g., C84.0-C84.7, C84.A, C84.Z) or a single lymph node site is documented.