ICD-10 Code C82.39 – Follicular lymphoma grade IIIa, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.39 – Follicular lymphoma grade IIIa, extranodal and solid organ sites
What it is
This code identifies follicular lymphoma grade IIIa involving extranodal or solid organ sites. It indicates a malignant B-cell lymphoma outside the lymph nodes, such as in an organ or other non-nodal tissue.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include a mass, organ enlargement, or symptoms related to the involved site, along with pathology confirming follicular lymphoma grade IIIa.
When to use this code
Use this code when the record clearly states follicular lymphoma grade IIIa and specifies extranodal or solid organ involvement. It also applies when pathology or oncology documentation identifies the primary site as non-nodal tissue. Check documentation if the site is only described broadly.
Do not use for
Do not use this code for nodal follicular lymphoma, lower-grade follicular lymphoma, or unspecified follicular lymphoma. If the grade or site is not documented, use the more specific or unspecified code supported by the record.
Coding tip
Always verify both the grade and the extranodal or solid organ site before assigning C82.39.