ICD-10 Code C84.70 – Anaplastic Large Cell Lymphoma, ALK-Negative, Unspecified Site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.70 – Anaplastic large cell lymphoma, ALK-negative, unspecified site
What it is
This code identifies anaplastic large cell lymphoma that is ALK-negative and not documented to a specific anatomic site. Use it for a confirmed lymphoma diagnosis when the record does not specify location.
Clinical signs
Clinical features vary; refer to documentation. Commonly, you may see enlarged lymph nodes, systemic “B” symptoms, or extranodal involvement, but the diagnosis should be supported by pathology and oncology records.
When to use this code
Use this code when the provider documents ALK-negative anaplastic large cell lymphoma and does not name the involved site. It is appropriate for confirmed cases in pathology, oncology, or discharge documentation. If the site is later specified, code the documented site instead.
Do not use for
Do not use this code for ALK-positive anaplastic large cell lymphoma or for nonspecific “lymphoma” without the required histologic detail. Check documentation if the site or subtype is unclear.
Coding tip
Query the provider when ALK status or site is missing, because this code requires both ALK-negative status and an unspecified site.