ICD-10 Code C84.13 – Sézary disease, intra-abdominal lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.13 – Sézary disease, intra-abdominal lymph nodes
What it is
This code identifies Sézary disease involving intra-abdominal lymph nodes. It is used when the record documents this specific cutaneous T-cell lymphoma site.
Clinical signs
Clinical features vary; refer to documentation. Sézary disease is a leukemic form of cutaneous T-cell lymphoma, and nodal involvement may be noted on imaging, exam, or pathology.
When to use this code
Use C84.13 when the provider documents Sézary disease with intra-abdominal lymph node involvement. Code it from pathology, oncology, or discharge documentation that clearly links the disease to these nodes.
If the record only says Sézary disease without a nodal site, or names another lymph node region, check documentation before assigning this code.
Do not use for
Do not use this code for Sézary disease without confirmed intra-abdominal lymph node involvement. Avoid it when the documentation identifies only skin, blood, or a different nodal location.
Coding tip
Confirm the exact lymph node site in the provider record before coding, because Sézary disease codes are location-specific.