ICD-10 Code C82.0 – Follicular lymphoma grade I (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.0 – Follicular lymphoma grade I
What it is
C82.0 identifies follicular lymphoma, grade I, a low-grade B-cell non-Hodgkin lymphoma. Use it when the pathology report specifically states grade I follicular lymphoma.
Clinical signs
Patients often present with painless lymph node enlargement, and clinical features vary; refer to documentation. Diagnosis is usually established by biopsy and histology showing follicular lymphoma.
When to use this code
Use C82.0 when the provider documents follicular lymphoma grade I or equivalent wording in the pathology or assessment. Code it for confirmed cases at diagnosis, staging, or follow-up when the grade remains documented. If the record only says follicular lymphoma without grade, check documentation.
Do not use for
Do not use this code for other follicular lymphoma grades or for unspecified non-Hodgkin lymphoma. If the pathology does not confirm grade I, check documentation before assigning C82.0.
Coding tip
Match the code to the exact histologic grade in the pathology report, not to presumed severity.