ICD-10 Code C82.90 – Follicular lymphoma, unspecified, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.90 – Follicular lymphoma, unspecified, unspecified site
What it is
C82.90 identifies follicular lymphoma when the subtype is not further specified and the anatomic site is not documented. Use it for a non-Hodgkin lymphoma diagnosis recorded at a general, unspecified level.
Clinical signs
Clinical features vary; refer to documentation. Follicular lymphoma is often noted as enlarged lymph nodes, sometimes with slow progression, but the record must support the diagnosis and the unspecified site.
When to use this code
Use C82.90 when the provider documents follicular lymphoma but does not specify the site or more detailed subtype. It also fits when the chart confirms follicular lymphoma and no further anatomic detail is available. If a specific nodal or extranodal site is documented, code that instead.
Do not use for
Do not use this code for other non-Hodgkin lymphomas, Hodgkin lymphoma, or a more specific follicular lymphoma code when the site is known. Check documentation if the diagnosis is incomplete.
Coding tip
Query for the involved site and any more specific follicular lymphoma description before defaulting to C82.90.