ICD-10 Code C84.15 – Sézary disease, lymph nodes of inguinal region and lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.15 – Sézary disease, lymph nodes of inguinal region and lower limb
What it is
C84.15 identifies Sézary disease involving the lymph nodes of the inguinal region and lower limb. Use it when documentation specifies this cutaneous T-cell lymphoma pattern and nodal location.
Clinical signs
Clinical features vary; refer to documentation. Sézary disease is typically associated with diffuse skin involvement and lymph node disease, but this code is location-specific to inguinal and lower-limb nodes.
When to use this code
Use C84.15 when the record clearly states Sézary disease with involvement of lymph nodes in the groin, inguinal area, or lower extremity. Apply it when the provider documents this anatomic site as the coded diagnosis. If the site is not specified, check documentation before assigning a more general lymphoma code.
Do not use for
Do not use this code for Sézary disease without documented inguinal or lower-limb nodal involvement. It is also wrong for other lymphomas, nonspecific lymphadenopathy, or skin findings alone.
Coding tip
Match the exact nodal site in the note; if the location is unclear, query the provider before coding.