ICD-10 Code C83.33 – Diffuse large B-cell lymphoma, intra-abdominal lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.33 – Diffuse large B-cell lymphoma, intra-abdominal lymph nodes
What it is
C83.33 identifies diffuse large B-cell lymphoma involving intra-abdominal lymph nodes. Use it when the documentation specifies this lymphoma subtype and nodal location.
Clinical signs
Clinical features vary; refer to documentation. Common findings in lymphoma may include enlarged lymph nodes, abdominal discomfort, or imaging evidence of intra-abdominal nodal disease.
When to use this code
Use this code when the provider documents diffuse large B-cell lymphoma confined to, or primarily involving, intra-abdominal lymph nodes. It also fits pathology or oncology notes that clearly name this exact site. If the record only says large B-cell lymphoma without location, check documentation.
Do not use for
Do not use C83.33 for other non-Hodgkin lymphomas, unspecified lymphoma, or diffuse large B-cell lymphoma at a different nodal site. Check documentation if the site is extranodal or not stated.
Coding tip
Code the exact lymphoma subtype and anatomic site from the provider’s final diagnosis, not from suspicion or imaging alone.