ICD-10 Code C83.59 – Lymphoblastic (diffuse) lymphoma, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.59 – Lymphoblastic (diffuse) lymphoma, extranodal and solid organ sites
What it is
This code identifies lymphoblastic lymphoma involving extranodal or solid organ sites. It describes a malignant lymphoid cancer outside the lymph nodes, documented as diffuse and lymphoblastic.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include a mass or organ-specific involvement, with pathology confirming lymphoblastic lymphoma and the extranodal site noted in the record.
When to use this code
Use C83.59 when the provider documents lymphoblastic lymphoma affecting an extranodal or solid organ site, such as an organ-based mass or non-nodal disease site. Code it from the confirmed diagnosis, not from suspicion alone. Check documentation for the exact site and wording.
Do not use for
Do not use this code for lymphoblastic lymphoma limited to lymph nodes or for other lymphoma subtypes. If the record does not specify extranodal or solid organ involvement, check documentation.
Coding tip
Verify the pathology and site documentation before assigning C83.59, because the anatomic location drives code selection.