ICD-10 Code C84.4A – Peripheral T-cell lymphoma, not elsewhere classified, in remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.4A – Peripheral T-cell lymphoma, not elsewhere classified, in remission
What it is
This code identifies a history of peripheral T-cell lymphoma, not otherwise specified, when the disease is documented as in remission. Use it when the lymphoma remains a relevant condition, but there is no active disease noted.
Clinical signs
Clinical features vary; refer to documentation. In remission, you may see no current lymphoma symptoms, with prior records showing a confirmed peripheral T-cell lymphoma diagnosis and follow-up indicating disease control.
When to use this code
Use this code when the provider clearly documents peripheral T-cell lymphoma, not elsewhere classified, as in remission. It is appropriate for ongoing oncology follow-up, surveillance visits, or problem lists when the malignancy is not currently active.
Check documentation if the chart only states a past history of lymphoma without remission status. If active disease, relapse, or treatment for current lymphoma is documented, code the current condition instead.
Do not use for
Do not use this code for active peripheral T-cell lymphoma or unspecified lymphoma history alone. Do not assign it when the record does not confirm remission status; check documentation.
Coding tip
Verify the exact lymphoma type and remission wording in the provider note before coding.