ICD-10 Code C82.09 – Follicular lymphoma grade I, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.09 – Follicular lymphoma grade I, extranodal and solid organ sites
What it is
This code identifies low-grade follicular lymphoma, a slow-growing B-cell non-Hodgkin lymphoma, when it arises in extranodal or solid organ sites. Use it when the record specifies grade I disease at a non-nodal location.
Clinical signs
Clinical features vary; refer to documentation. Extranodal follicular lymphoma may present as a mass or organ-specific abnormality, with diagnosis confirmed by pathology and site documentation.
When to use this code
Use C82.09 when the provider documents follicular lymphoma grade I involving extranodal tissue or a solid organ, and the site is not a lymph node. This code fits pathology-confirmed cases with clear anatomic documentation. If the record does not specify grade or site, check documentation before coding.
Do not use for
Do not use this code for follicular lymphoma in lymph nodes or when the grade is not documented as grade I. It is also not appropriate for other lymphoma types or unspecified sites.
Coding tip
Verify both grade and anatomic site in the pathology or oncology note before assigning C82.09.