ICD-10 Code C83.05 – Small cell B-cell lymphoma, lymph nodes of inguinal region and lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.05 – Small cell B-cell lymphoma, lymph nodes of inguinal region and lower limb
What it is
C83.05 identifies a small cell B-cell lymphoma located in the inguinal lymph nodes or lower limb lymph nodes. Use it when documentation specifies this lymphoma subtype and site.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records note enlarged lymph nodes in the groin or lower extremity region, with pathology confirming a small cell B-cell lymphoma pattern.
When to use this code
Use this code when the provider documents small cell B-cell lymphoma affecting inguinal or lower limb lymph nodes. It is appropriate for confirmed diagnosis, staging, or follow-up visits tied to that site-specific lymphoma. Check documentation if the record only says lymphoma without subtype or anatomic location.
Do not use for
Do not use it for unspecified lymphoma, other B-cell lymphoma types, or lymphomas in different nodal regions. If the site or histology is unclear, check documentation.
Coding tip
Verify both the lymphoma subtype and the exact nodal location before assigning C83.05.