ICD-10 Code C84.65 – Anaplastic large cell lymphoma, ALK-positive, lymph nodes of inguinal region and lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.65 – Anaplastic large cell lymphoma, ALK-positive, lymph nodes of inguinal region and lower limb
What it is
This code identifies ALK-positive anaplastic large cell lymphoma involving lymph nodes in the inguinal region and lower limb. Use it for a documented lymphoma diagnosis with this specific nodal location.
Clinical signs
Clinical features vary; refer to documentation. Patients may present with enlarged inguinal or lower-limb lymph nodes, and diagnosis is typically confirmed by pathology and immunophenotyping showing ALK positivity.
When to use this code
Use this code when the provider documents ALK-positive anaplastic large cell lymphoma and specifies the inguinal region or lower limb lymph nodes as the site. It may also fit when the record clearly links the lymphoma to those nodes. Check documentation if the site is uncertain.
Do not use for
Do not use this code for other non-Hodgkin lymphomas, ALK-negative disease, or lymphoma in unspecified or different nodal regions. If the chart does not confirm the exact site, check documentation.
Coding tip
Code the documented lymphoma subtype and nodal location exactly as stated; site specificity matters here.