ICD-10 Code C82.19 – Follicular lymphoma grade II, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.19 – Follicular lymphoma grade II, extranodal and solid organ sites
What it is
This code identifies follicular lymphoma grade II involving extranodal tissue or a solid organ. Use it when the record specifies this lymphoma subtype and location.
Clinical signs
Clinical features vary; refer to documentation. Follicular lymphoma is often an indolent B-cell lymphoma with enlarged lymph nodes or extranodal involvement confirmed by pathology.
When to use this code
Use C82.19 when the provider documents grade II follicular lymphoma in an extranodal site or solid organ, such as gastrointestinal, skin, or other non-nodal involvement. The site and grade should be clearly stated in the chart. If the site is unspecified, check documentation.
Do not use for
Do not use this code for nodal-only follicular lymphoma, other grades, or other lymphoma types. If the record does not confirm grade II and extranodal or solid organ involvement, check documentation.
Coding tip
Match the lymphoma grade and anatomic site exactly as documented before assigning C82.19.