ICD-10 Code C84.6 – Anaplastic large cell lymphoma, ALK-positive (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.6 – Anaplastic large cell lymphoma, ALK-positive
What it is
C84.6 identifies anaplastic large cell lymphoma that is ALK-positive, a T-cell lymphoma with abnormal anaplastic lymphoma kinase expression. Use it for the specific confirmed diagnosis, not for unspecified lymphoma.
Clinical signs
Clinical features vary; refer to documentation. Common findings include enlarged lymph nodes, systemic “B” symptoms, and extranodal disease, but the record should support the ALK-positive subtype.
When to use this code
Use C84.6 when the provider documents anaplastic large cell lymphoma and specifies ALK-positive status. This may appear in pathology, oncology, or discharge documentation. If the subtype or ALK status is not stated, check documentation before coding.
Do not use for
Do not use this code for ALK-negative anaplastic large cell lymphoma or other non-Hodgkin lymphomas. If the diagnosis is only suspected, pending, or unspecified, do not assign C84.6.
Coding tip
Code C84.6 only when the pathology or oncologist clearly documents ALK-positive anaplastic large cell lymphoma.