Other mature T/NK-cell lymphomas, intrathoracic lymph nodes

This code signifies a diagnosis of mature T-cell or NK-cell lymphoma that doesn't fit into more specific categories, and specifically involves lymph nodes located within the chest cavity. These are aggressive non-Hodgkin lymphomas originating from mature T-lymphocytes or natural killer cells. The "other" designation implies that the specific subtype is not otherwise classified.

Assign this code when documentation confirms a diagnosis of an unspecified or "other" mature T/NK-cell lymphoma, and imaging or biopsy reports clearly indicate involvement of intrathoracic lymph nodes (e.g., mediastinal, hilar, or paratracheal lymph nodes). This code is appropriate when a more precise subtype of mature T/NK-cell lymphoma cannot be determined from the available clinical information.

• Ensure the documentation explicitly states "intrathoracic lymph nodes" or specifies lymph node locations within the chest.
• Do not use this code if a more specific mature T/NK-cell lymphoma subtype (e.g., anaplastic large cell lymphoma) is identified.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis if it's a co-morbidity.