ICD-10 Code C82.49 – Follicular lymphoma grade IIIb, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.49 – Follicular lymphoma grade IIIb, extranodal and solid organ sites
What it is
C82.49 identifies follicular lymphoma grade IIIb when it involves extranodal or solid organ sites. Use it for a documented high-grade follicular lymphoma outside lymph nodes, such as in an organ or other non-nodal tissue.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include a biopsy-confirmed follicular lymphoma pattern, with disease described as grade IIIb and located in an extranodal or solid organ site.
When to use this code
Use this code when the provider documents follicular lymphoma grade IIIb and specifies an extranodal or solid organ site. It is appropriate when the record clearly identifies both the grade and the anatomic location.
If the site is not stated, or the lymphoma is described differently, check documentation before coding. Confirm that the diagnosis is current and that the record supports the coded site.
Do not use for
Do not use C82.49 for other follicular lymphoma grades, unspecified sites, or nodal disease only. If the documentation does not support grade IIIb or an extranodal/solid organ site, check documentation.
Coding tip
Code only when both the grade and the extranodal or solid organ site are documented clearly in the chart.