ICD-10 Code C84.11 – Sézary disease, lymph nodes of head, face, and neck (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.11 – Sézary disease, lymph nodes of head, face, and neck
What it is
C84.11 identifies Sézary disease involving lymph nodes of the head, face, and neck. Use it when documentation specifies nodal involvement at these sites as part of this cutaneous T-cell lymphoma.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings in Sézary disease include diffuse skin redness, itching, and enlarged lymph nodes, but this code is specific to the head, face, and neck nodes.
When to use this code
Use C84.11 when the provider documents Sézary disease with involvement of lymph nodes in the head, face, or neck. It may appear in oncology, dermatology, or pathology records when nodal disease is clearly localized to these regions.
If the note only states Sézary disease without nodal site detail, check documentation before assigning this code. Code the most specific documented anatomic site whenever the record supports it.
Do not use for
Do not use this code for Sézary disease without documented lymph node involvement in the head, face, or neck. It is also not for other cutaneous lymphomas or unspecified nodal disease.
Coding tip
Verify the exact lymph node location in the chart; if the anatomic site is not stated, do not assume C84.11.