ICD-10 Code C82.20 – Follicular lymphoma grade III, unspecified, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.20 – Follicular lymphoma grade III, unspecified, unspecified site
What it is
C82.20 identifies follicular lymphoma grade III when the site is not specified. Use it for a documented follicular lymphoma with higher-grade histology, but without a more precise anatomic location.
Clinical signs
Clinical features vary; refer to documentation. Follicular lymphoma may present with painless lymphadenopathy, fatigue, or incidental findings on imaging or biopsy, but the grade and site must be confirmed in the record.
When to use this code
Use this code when the provider documents follicular lymphoma grade III and does not identify a specific nodal or extranodal site. It also fits when the site is listed as unspecified in the pathology or clinical note. If a more specific site is documented, code that instead.
Do not use for
Do not use this code for follicular lymphoma grade I or II, or for grade III with a specified site. Check documentation if the record names another lymphoma type or a different anatomic location.
Coding tip
Confirm both the grade and the site in the pathology or oncology note before assigning C82.20.