ICD-10 Code C83.09 – Small cell B-cell lymphoma, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.09 – Small cell B-cell lymphoma, extranodal and solid organ sites
What it is
This code identifies small cell B-cell lymphoma 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. Common findings may include a mass or organ-specific enlargement, with diagnosis confirmed by pathology and site documentation.
When to use this code
Use C83.09 when the provider documents small cell B-cell lymphoma in an extranodal site or solid organ, such as a non-nodal tissue location. Code the documented anatomic site when available, and confirm the subtype is not described elsewhere more specifically. Check documentation if the site or histology is unclear.
Do not use for
Do not use this code for nodal lymphoma without extranodal or solid organ involvement. Also avoid it when the record names a different lymphoma type or provides insufficient detail; check documentation.
Coding tip
Verify both the lymphoma subtype and the site before assigning C83.09.