ICD-10 Code C84.Z2 – Other mature T/NK-cell lymphomas, intrathoracic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.Z2 – Other mature T/NK-cell lymphomas, intrathoracic lymph nodes
What it is
This code identifies a mature T-cell or NK-cell lymphoma involving the intrathoracic lymph nodes. Use it when the record specifies this lymphoma type and location, but not a more specific subtype.
Clinical signs
Clinical features vary; refer to documentation. Common findings in lymphoma may include enlarged lymph nodes, chest-related symptoms, or systemic “B” symptoms, but you should code only what is documented.
When to use this code
Use this code when the provider documents other mature T/NK-cell lymphoma affecting intrathoracic lymph nodes and no more specific ICD-10-CM code applies. It is appropriate for pathology, oncology, or discharge documentation that clearly identifies this site and lymphoma category.
If the note names a different lymphoma subtype, a different nodal region, or a nonspecific lymphoid malignancy, check documentation before assigning C84.Z2.
Do not use for
Do not use this code for Hodgkin lymphoma, B-cell lymphomas, or lymph node disease outside the intrathoracic region. Do not use it when the record lacks documentation of both the mature T/NK-cell lymphoma and the site.
Coding tip
Match the exact lymphoma type and anatomical site in the pathology or oncology note before coding C84.Z2.