Mature T/NK-cell lymphomas, unsp, intrathoracic lymph nodes

This code signifies a diagnosis of mature T-cell or NK-cell lymphoma that is not further specified as to its exact subtype, and is specifically located within the intrathoracic lymph nodes. These are aggressive non-Hodgkin lymphomas originating from mature T-lymphocytes or natural killer cells, affecting lymph nodes within the chest cavity.

Use this code when documentation confirms a diagnosis of mature T/NK-cell lymphoma with an unspecified subtype, and imaging or biopsy reports localize the primary involvement to intrathoracic lymph nodes. This code is appropriate when the specific subtype of mature T/NK-cell lymphoma (e.g., anaplastic large cell lymphoma, peripheral T-cell lymphoma, NOS) has not been definitively identified.

• Ensure documentation explicitly states "unspecified" mature T/NK-cell lymphoma and "intrathoracic lymph nodes."
• Do not use if a more specific subtype of mature T/NK-cell lymphoma is identified; instead, code to the specific subtype.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any associated symptoms or complications.