ICD-10 Code C82.29 – Follicular lymphoma grade III, unspecified, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.29 – Follicular lymphoma grade III, unspecified, extranodal and solid organ sites
What it is
This code identifies follicular lymphoma grade III involving extranodal tissue or a solid organ, when the record does not specify a more exact site. Use it for a high-grade follicular lymphoma diagnosis documented outside lymph nodes.
Clinical signs
Clinical features vary; refer to documentation. Patients may have a biopsy-confirmed follicular lymphoma with disease noted in an extranodal or solid organ site rather than nodal disease alone.
When to use this code
Use C82.29 when the provider documents follicular lymphoma grade III and specifies an extranodal or solid organ location, but not a more detailed anatomic site. It also fits when the site is known to be outside lymph nodes and the record lacks further specificity. Check documentation if the grade or site is unclear.
Do not use for
Do not use this code for follicular lymphoma at nodal sites only, or when the record does not confirm grade III. If the documentation names a different lymphoma type or a more specific site code, use that instead.
Coding tip
Verify both the grade and the extranodal or solid organ site in the pathology or oncology note before assigning C82.29.