ICD-10 Code C83.50 – Lymphoblastic (diffuse) lymphoma, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.50 – Lymphoblastic (diffuse) lymphoma, unspecified site
What it is
C83.50 identifies lymphoblastic lymphoma when the site is not specified. Use it for an aggressive non-Hodgkin lymphoma made of immature lymphoid cells, commonly documented as diffuse and not tied to one anatomic location.
Clinical signs
Clinical features vary; refer to documentation. Common findings include rapidly enlarging lymph nodes, mediastinal mass, or other extranodal involvement, with pathology confirming lymphoblastic lymphoma.
When to use this code
Use this code when the provider documents lymphoblastic lymphoma and does not specify a primary site. It also fits cases described as diffuse or widespread without a more precise anatomic designation. If the record names a specific site, code that site instead.
Do not use for
Do not use C83.50 for acute lymphoblastic leukemia or for other non-Hodgkin lymphoma subtypes. If the documentation gives a different lymphoma type or a defined site, check documentation and select the more specific code.
Coding tip
Confirm whether the record says “unspecified site” before assigning C83.50.