ICD-10 Code C83.58 – Lymphoblastic (diffuse) lymphoma, lymph nodes of multiple sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.58 – Lymphoblastic (diffuse) lymphoma, lymph nodes of multiple sites
What it is
C83.58 identifies lymphoblastic lymphoma involving lymph nodes at multiple sites. Use it for a malignant lymphoid neoplasm described as diffuse or lymphoblastic, not for unrelated lymph node enlargement.
Clinical signs
Clinical features vary; refer to documentation. Commonly, you may see enlarged lymph nodes at more than one site, with pathology confirming lymphoblastic lymphoma rather than another lymphoma type.
When to use this code
Use this code when the provider documents lymphoblastic lymphoma affecting lymph nodes of multiple sites, or when pathology and clinical notes clearly support that diagnosis. It fits confirmed disease involving multiple nodal regions, not a single localized node.
If the record only says “lymphoma” or “lymphadenopathy,” check documentation before coding. Confirm the lymphoblastic subtype and the multi-site lymph node involvement.
Do not use for
Do not use this code for reactive lymphadenopathy, unspecified lymphoma, or other non-lymphoblastic lymphomas. Check documentation if the site, histology, or extent is unclear.
Coding tip
Code C83.58 only when both the lymphoblastic subtype and multiple lymph node sites are explicitly documented.