ICD-10 Code C82.3 – Follicular lymphoma grade IIIa (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.3 – Follicular lymphoma grade IIIa
What it is
C82.3 identifies follicular lymphoma, grade IIIa, a type of non-Hodgkin lymphoma with a follicular growth pattern. Use it when the pathology report specifically states grade IIIa.
Clinical signs
Patients may present with painless lymphadenopathy, and disease can involve nodal or extranodal sites. Clinical features vary; refer to documentation and the pathology report for the exact grade.
When to use this code
Use this code when the confirmed diagnosis is follicular lymphoma grade IIIa and the record supports that specific histology. It is appropriate for encounters documenting staging, follow-up, or management of this exact lymphoma subtype. If the grade is not stated, check documentation before assigning C82.3.
Do not use for
Do not use it for other follicular lymphoma grades, diffuse large B-cell lymphoma, or unspecified non-Hodgkin lymphoma. Check documentation if the pathology report does not clearly identify grade IIIa.
Coding tip
Code from the pathology-confirmed grade, not from a general lymphoma description.