ICD-10 Code C84.41 – Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of head, face, and neck (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.41 – Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of head, face, and neck
What it is
C84.41 identifies peripheral T-cell lymphoma, not elsewhere classified, when it involves lymph nodes in the head, face, or neck. Use it for this specific nodal lymphoma site, not for other lymphoma types or other anatomic locations.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include enlarged cervical or facial lymph nodes, persistent swelling, or other signs of lymphoma confirmed by pathology.
When to use this code
Use this code when the provider documents peripheral T-cell lymphoma, not elsewhere classified, with primary or involved lymph nodes of the head, face, or neck. It fits confirmed nodal disease at these sites and should match the documented anatomic location.
If the record only says peripheral T-cell lymphoma without a site, check documentation before assigning this code. Verify that the diagnosis is not a different lymphoma subtype or a different lymph node region.
Do not use for
Do not use this code for other T-cell lymphoma subtypes, unspecified lymphoma, or lymphoma outside the head, face, and neck nodes. Check documentation if the site or histology is unclear.
Coding tip
Always link the exact lymphoma wording and nodal location in the chart before coding C84.41.