ICD-10 Code C84.93 – Mature T/NK-cell lymphomas, unspecified, intra-abdominal lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.93 – Mature T/NK-cell lymphomas, unspecified, intra-abdominal lymph nodes
What it is
This code identifies a mature T-cell or NK-cell lymphoma that is not further specified and is documented as involving intra-abdominal lymph nodes. Use it when the record clearly states this lymphoma type and nodal location.
Clinical signs
Clinical features vary; refer to documentation. Typical lymphoma findings may include enlarged lymph nodes, abdominal pain or fullness, and systemic “B” symptoms, but the diagnosis should be supported by pathology or specialist assessment.
When to use this code
Use C84.93 when the provider documents mature T/NK-cell lymphoma, unspecified, with intra-abdominal lymph node involvement. It also fits when the site is confirmed as intra-abdominal nodes but the subtype is not more specific.
Do not substitute a different lymphoma code just because the note mentions abdominal symptoms or generalized lymphadenopathy. Code the documented histology and anatomic site exactly as recorded.
Do not use for
Do not use this code for B-cell lymphomas, Hodgkin lymphoma, or lymphomas in other nodal regions. Check documentation if the pathology type or lymph node site is unclear.
Coding tip
Confirm both the mature T/NK-cell lymphoma diagnosis and the intra-abdominal lymph node location before assigning C84.93.