ICD-10 Code C83.35 – Diffuse large B-cell lymphoma, lymph nodes of inguinal region and lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.35 – Diffuse large B-cell lymphoma, lymph nodes of inguinal region and lower limb
What it is
This code identifies diffuse large B-cell lymphoma involving lymph nodes in the inguinal region or lower limb. Use it when the record specifies this anatomic site and the diagnosis is diffuse large B-cell lymphoma.
Clinical signs
Clinical features vary; refer to documentation. Common findings include enlarged lymph nodes in the groin or leg region, sometimes with a rapidly enlarging mass and other lymphoma-related symptoms.
When to use this code
Use C83.35 when the provider documents diffuse large B-cell lymphoma and clearly links it to lymph nodes of the inguinal region or lower limb. It also fits pathology-confirmed disease at this site, even when the note is brief. Check documentation if the record only says lymphoma without site detail.
Do not use for
Do not use this code for unspecified lymphoma, other B-cell lymphomas, or disease in non-nodal tissues. If the site is different or not documented, choose the more accurate code or check documentation.
Coding tip
Confirm both the lymphoma type and the exact nodal location before assigning C83.35.