ICD-10 Code C84.79 – Anaplastic large cell lymphoma, ALK-negative, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.79 – Anaplastic large cell lymphoma, ALK-negative, extranodal and solid organ sites
What it is
This code identifies anaplastic large cell lymphoma that is ALK-negative and involves extranodal or solid organ sites. Use it for documented disease outside lymph nodes, such as organ or soft-tissue involvement.
Clinical signs
Clinical features vary; refer to documentation. Commonly, you may see a mass or infiltrative lesion in an extranodal site, with pathology confirming anaplastic large cell lymphoma and ALK negativity.
When to use this code
Use C84.79 when the provider documents ALK-negative anaplastic large cell lymphoma affecting extranodal tissues or a solid organ. It is appropriate when the site is specified as extranodal and not limited to lymph nodes. Check documentation if the record only states lymphoma without site or ALK status.
Do not use for
Do not use this code for ALK-positive anaplastic large cell lymphoma or for cases limited to lymph nodes. If the documentation does not confirm extranodal or solid organ involvement, check documentation.
Coding tip
Code the lymphoma type, ALK status, and anatomic site exactly as documented to avoid using a less specific lymphoma code.