ICD-10 Code C84.1A – Sézary disease, in remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.1A – Sézary disease, in remission
What it is
C84.1A identifies Sézary disease that is documented as being in remission. Use it when the patient has a prior confirmed diagnosis and the current record states the disease is no longer active. Check documentation for the remission status.
Clinical signs
Clinical features vary; refer to documentation. Sézary disease is a cutaneous T-cell lymphoma that may present with widespread skin redness, itching, and lymph node involvement, but this code applies only when the condition is recorded as in remission.
When to use this code
Use this code when the provider clearly documents Sézary disease as in remission on the encounter date. It is appropriate for follow-up visits, surveillance, or records that note no active disease. If remission is not stated, check documentation before assigning this code.
Do not use for
Do not use C84.1A for active Sézary disease, suspected disease, or a history of the condition without current remission. If the chart only says “status post” or “history of,” check documentation for the correct code.
Coding tip
Code remission only when the provider explicitly documents it; otherwise, query or select the active disease code as supported by the record.