ICD-10 Code C84.ZA – Other mature T/NK-cell lymphomas, in remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.ZA – Other mature T/NK-cell lymphomas, in remission
What it is
This code identifies a history of other mature T-cell or NK-cell lymphoma that is currently in remission. Use it when the lymphoma is no longer active, but the diagnosis remains clinically relevant.
Clinical signs
Clinical features vary; refer to documentation. Remission is typically supported by oncology notes showing no evidence of active disease or ongoing response after treatment.
When to use this code
Use this code when the provider documents other mature T/NK-cell lymphoma as being in remission, including complete or partial remission if specified. It is appropriate for follow-up visits, surveillance care, or when the prior lymphoma remains part of the patient’s problem list. Check documentation if the record only says “history of” without remission status.
Do not use for
Do not use this code for active lymphoma, relapse, or recurrent disease. If the note does not clearly state remission, check documentation before coding.
Coding tip
Code the remission status exactly as documented, and do not assume remission from treatment history alone.