ICD-10 Code C83.55 – Lymphoblastic (diffuse) lymphoma, lymph nodes of inguinal region and lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.55 – Lymphoblastic (diffuse) lymphoma, lymph nodes of inguinal region and lower limb
What it is
This code identifies lymphoblastic lymphoma involving lymph nodes in the inguinal region or lower limb. It is a malignant lymphoid neoplasm with disease location documented in those nodal sites.
Clinical signs
Typical findings include enlarged, firm lymph nodes in the groin or lower extremity region, sometimes with pain or local swelling. Clinical features vary; refer to documentation.
When to use this code
Use C83.55 when the provider documents lymphoblastic lymphoma and specifies involvement of inguinal or lower-limb lymph nodes. Apply it for confirmed site-specific nodal disease, including pathology or imaging-supported documentation. If the site is not stated, check documentation before coding.
Do not use for
Do not use this code for nonspecific lymphoma without lymphoblastic type or without documented inguinal/lower-limb nodal involvement. Do not assign it when the record only says “lymphoma,” “lymphadenopathy,” or another anatomic site.
Coding tip
Match both the histology and the exact nodal location in the note before assigning C83.55.