ICD-10 Code C83.01 – Small cell B-cell lymphoma, lymph nodes of head, face, and neck (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.01 – Small cell B-cell lymphoma, lymph nodes of head, face, and neck
What it is
C83.01 identifies small cell B-cell lymphoma involving lymph nodes in the head, face, or neck. Use it when documentation specifies this lymphoma subtype and that nodal region.
Clinical signs
Clinical features vary; refer to documentation. Commonly, you may see enlarged cervical or facial lymph nodes and 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 lymph nodes of the head, face, or neck. It also fits biopsy-confirmed nodal disease in those sites when the diagnosis is stated clearly. If the note only says lymphoma without site or subtype, check documentation.
Do not use for
Do not use it for unspecified lymphoma, other B-cell lymphoma subtypes, or disease outside the head, face, and neck lymph nodes. Check documentation if the record names a different nodal region.
Coding tip
Match both the lymphoma subtype and the anatomic site exactly before assigning C83.01.