ICD-10 Code C84.64 – Anaplastic large cell lymphoma, ALK-positive, lymph nodes of axilla and upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.64 – Anaplastic large cell lymphoma, ALK-positive, lymph nodes of axilla and upper limb
What it is
This code identifies anaplastic large cell lymphoma, ALK-positive, involving lymph nodes in the axilla or upper limb. Use it when the record clearly states this specific lymphoma site and ALK-positive status.
Clinical signs
Common findings include enlarged lymph nodes in the axilla or nearby upper limb regions, often with a confirmed lymphoma diagnosis on pathology. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents ALK-positive anaplastic large cell lymphoma with nodal involvement limited to the axilla or upper limb. It also fits when pathology or oncology notes specify that exact site. If the site is unclear or another nodal region is named, check documentation.
Do not use for
Do not use this code for ALK-negative disease, unspecified lymphoma, or non-nodal disease. If the chart does not confirm the axillary or upper-limb lymph node site, check documentation.
Coding tip
Confirm both the ALK-positive subtype and the exact lymph node location before assigning C84.64.