ICD-10 Code C84.96 – Mature T/NK-cell lymphomas, unspecified, intrapelvic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.96 – Mature T/NK-cell lymphomas, unspecified, intrapelvic lymph nodes
What it is
This code identifies a mature T-cell or natural killer cell lymphoma affecting intrapelvic lymph nodes, when the exact subtype is not documented. Use it when the record confirms this lymphoma location but does not name a more specific entity.
Clinical signs
Clinical features vary; refer to documentation. Patients may have enlarged pelvic lymph nodes, systemic “B” symptoms, or findings from imaging and biopsy that support lymphoma involvement.
When to use this code
Use this code when the provider documents mature T/NK-cell lymphoma in intrapelvic lymph nodes and does not specify a more exact histology or site. It is appropriate for confirmed malignant lymph node disease within the pelvis. Check the pathology and assessment notes for laterality or a more specific diagnosis if available.
Do not use for
Do not use this code for lymphoma limited to non-pelvic nodes, a different lymphoma family, or a clearly documented specific T/NK-cell subtype. Check documentation if the site is uncertain.
Coding tip
Code the documented nodal site and the highest level of lymphoma specificity available; if the pathology is more precise, use that code instead.