ICD-10 Code C82.9 – Follicular lymphoma, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.9 – Follicular lymphoma, unspecified
What it is
C82.9 identifies follicular lymphoma when the record does not specify a subtype or grade. Use it for a non-Hodgkin lymphoma of follicle-center B cells documented simply as follicular lymphoma.
Clinical signs
Clinical features vary; refer to documentation. Common findings include painless lymph node enlargement, and some patients may have B symptoms such as fever, night sweats, or weight loss.
When to use this code
Use C82.9 when the clinician documents follicular lymphoma but does not identify a more specific follicular lymphoma code. It also fits when pathology or oncology notes confirm the diagnosis, but the chart lacks enough detail for a more precise code. Check documentation before assigning it.
Do not use for
Do not use this code if the record specifies a different lymphoma type, such as diffuse large B-cell lymphoma or Hodgkin lymphoma. Do not use it when a more specific follicular lymphoma code is documented.
Coding tip
If the pathology report or oncology note includes subtype, grade, or site details, code the most specific follicular lymphoma option available.