ICD-10 Code C83.0 – Small cell B-cell lymphoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.0 – Small cell B-cell lymphoma
What it is
C83.0 identifies small cell B-cell lymphoma, a non-Hodgkin lymphoma made up of small malignant B lymphocytes. Use it when the record specifically names this lymphoma type.
Clinical signs
Findings may include painless lymphadenopathy, splenomegaly, or other signs of indolent B-cell lymphoma. Clinical features vary; refer to documentation.
When to use this code
Use C83.0 when the provider documents small cell B-cell lymphoma as the diagnosis. It is appropriate for confirmed lymphoma cases in pathology, oncology, or discharge documentation. If the record only says “B-cell lymphoma” or is unclear, check documentation before coding.
Do not use for
Do not use this code for other specified non-Hodgkin lymphomas, leukemia, or reactive lymphoid hyperplasia. If the histology or lymphoma subtype is different, choose the more specific documented diagnosis.
Coding tip
Code from the exact lymphoma wording in the pathology or oncology note, and query the provider when the subtype is not explicit.