ICD-10 Code C82.59 – Diffuse follicle center lymphoma, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.59 – Diffuse follicle center lymphoma, extranodal and solid organ sites
What it is
This code identifies diffuse follicle center lymphoma involving extranodal or solid organ sites. Use it when documentation specifies this lymphoma type outside lymph nodes, such as in an organ or other non-nodal tissue.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a mass or organ-specific symptoms, and diagnosis is usually confirmed by pathology and immunophenotyping.
When to use this code
Use C82.59 when the provider documents diffuse follicle center lymphoma at an extranodal or solid organ site. Apply it when the record clearly identifies the site as non-nodal and does not describe a different lymphoma subtype.
If the site is stated only as “extranodal” or a specific solid organ, this code may fit. Check documentation carefully when the chart also mentions nodal disease, transformation, or another lymphoma diagnosis.
Do not use for
Do not use this code for follicular lymphoma confined to lymph nodes or for a different lymphoma subtype. Check documentation if the site is unspecified or if the record does not confirm extranodal or solid organ involvement.
Coding tip
Code the exact anatomic site and lymphoma wording from the pathology or oncologist’s note; if the site is unclear, query the provider.