ICD-10 Code C84.46 – Peripheral T-cell lymphoma, not elsewhere classified, intrapelvic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.46 – Peripheral T-cell lymphoma, not elsewhere classified, intrapelvic lymph nodes
What it is
C84.46 identifies peripheral T-cell lymphoma, not elsewhere classified, involving intrapelvic lymph nodes. Use it when the record specifies this lymphoma subtype and the pelvic nodal site.
Clinical signs
Clinical features vary; refer to documentation. Typical lymphoma findings may include enlarged lymph nodes, constitutional symptoms, or imaging evidence of nodal disease, but the site and histology must be confirmed.
When to use this code
Use this code when pathology, oncology, or discharge documentation states peripheral T-cell lymphoma, not elsewhere classified, in intrapelvic lymph nodes. It may also apply when the diagnosis is carried forward as the active condition for ongoing care.
Code only when the anatomic site is clearly documented as intrapelvic lymph nodes. If the record names a different nodal region, a different lymphoma subtype, or says “check documentation,” do not assume C84.46.
Do not use for
Do not use this code for unspecified lymphoma, other T-cell lymphomas, or disease in non-pelvic nodes. Check documentation if the pathology report does not clearly match this exact diagnosis.
Coding tip
Confirm both the histologic subtype and the pelvic nodal location before assigning C84.46.