ICD-10 Code C83.398 – Diffuse large B-cell lymphoma of other extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.398 – Diffuse large B-cell lymphoma of other extranodal and solid organ sites
What it is
This code identifies diffuse large B-cell lymphoma involving an extranodal or solid organ site not named elsewhere. It is used for a specific aggressive non-Hodgkin lymphoma diagnosis documented outside lymph nodes.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include a biopsy-confirmed diffuse large B-cell lymphoma with disease described in an extranodal organ or solid tissue site rather than nodal disease.
When to use this code
Use this code when the provider documents diffuse large B-cell lymphoma in an extranodal or solid organ site and does not name a more specific site code. It also fits when pathology or oncology notes confirm the site as “other extranodal” or “solid organ.” Check documentation if the site is unclear or mixed with nodal involvement.
Do not use for
Do not use it for diffuse large B-cell lymphoma limited to lymph nodes or for a more specific extranodal site with its own code. If the record only says lymphoma without subtype or site, check documentation.
Coding tip
Code the most specific documented site first, and use C83.398 only when the extranodal or solid organ location is not otherwise classified.