ICD-10 Code C82.41 – Follicular lymphoma grade IIIb, lymph nodes of head, face, and neck (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.41 – Follicular lymphoma grade IIIb, lymph nodes of head, face, and neck
What it is
This code identifies follicular lymphoma grade IIIb involving lymph nodes in the head, face, or neck. Use it when the record specifies this lymphoma subtype and anatomic site.
Clinical signs
Clinical features vary; refer to documentation. Commonly, follicular lymphoma is noted as a lymph node malignancy with enlarged nodes, and grade IIIb indicates a high-grade histologic pattern.
When to use this code
Use C82.41 when the provider documents follicular lymphoma grade IIIb and names lymph nodes of the head, face, or neck as the involved site. You may also use it when pathology or oncology notes clearly support that exact diagnosis. If the site or grade is not stated, check documentation.
Do not use for
Do not use this code for other follicular lymphoma grades or for nodal disease in a different body region. It is also not appropriate when the record only says lymphoma without confirming grade IIIb and the head, face, or neck site.
Coding tip
Verify both the grade and the lymph node location before assigning C82.41.