ICD-10 Code C84.16 – Sézary disease, intrapelvic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.16 – Sézary disease, intrapelvic lymph nodes
What it is
C84.16 identifies Sézary disease involving intrapelvic lymph nodes. Use it when the record documents this cutaneous T-cell lymphoma with pelvic nodal involvement.
Clinical signs
Clinical features vary; refer to documentation. Sézary disease is typically associated with diffuse skin findings, lymph node enlargement, and circulating malignant T cells in standard references.
When to use this code
Use this code when the provider specifically documents Sézary disease affecting intrapelvic lymph nodes. It may appear in oncology, dermatology, or pathology records describing nodal spread or staging. If the note only says Sézary syndrome without nodal site, check documentation.
Do not use for
Do not use it for nonspecific mycosis fungoides, other lymphoma types, or Sézary disease with a different nodal site. Check documentation if the pelvic node involvement is not clearly stated.
Coding tip
Match the exact anatomic site in the provider’s note before assigning C84.16.