ICD-10 Code C83.56 – Lymphoblastic (diffuse) lymphoma, intrapelvic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.56 – Lymphoblastic (diffuse) lymphoma, intrapelvic lymph nodes
What it is
This code identifies lymphoblastic lymphoma involving the intrapelvic lymph nodes. Use it when documentation specifies this lymphoma subtype and pelvic nodal location.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include enlarged pelvic lymph nodes, mass effect, or other evidence of lymphoma on imaging or biopsy.
When to use this code
Use C83.56 when the provider documents lymphoblastic lymphoma and clearly localizes it to intrapelvic lymph nodes. It may also apply when pathology or imaging confirms pelvic nodal involvement and the diagnosis is recorded in the chart.
If the record only says lymphoma without subtype or site, check documentation before coding. Verify whether the case is a primary nodal diagnosis, a known recurrence, or a more general lymphoma description.
Do not use for
Do not use this code for unspecified lymphoma, non-lymphoblastic lymphoma, or disease limited to non-pelvic lymph nodes. Check documentation if the anatomic site is unclear.
Coding tip
Match both the lymphoma subtype and the intrapelvic nodal site exactly as documented before assigning C83.56.