ICD-10 Code C82.10 – Follicular lymphoma grade II, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.10 – Follicular lymphoma grade II, unspecified site
What it is
C82.10 identifies follicular lymphoma, grade II, when the record does not specify the involved site. It is a non-Hodgkin lymphoma diagnosis used when the pathology confirms grade II disease.
Clinical signs
Clinical features vary; refer to documentation. Common findings in follicular lymphoma include painless lymph node enlargement and, in some cases, fatigue or other nonspecific lymphoma-related symptoms.
When to use this code
Use this code when the provider documents follicular lymphoma grade II and does not name a specific anatomic site. It also fits when the diagnosis is confirmed, but the note only states “unspecified site.” Verify that the grade and site are both supported in the record.
Do not use for
Do not use this code for other lymphoma grades, for follicular lymphoma with a specified site, or when the documentation only says “lymphoma” without grade II confirmation. Check documentation.
Coding tip
Match both the histologic grade and site wording exactly; if either is unclear, query the provider before assigning C82.10.