ICD-10 Code C81.91 – Hodgkin lymphoma, unspecified, lymph nodes of head, face, and neck (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C81.91 – Hodgkin lymphoma, unspecified, lymph nodes of head, face, and neck
What it is
This code identifies Hodgkin lymphoma when the type is not further specified and the involved lymph nodes are in the head, face, or neck. Use it when the record confirms this lymphoma site but does not name a more specific Hodgkin subtype.
Clinical signs
Clinical features vary; refer to documentation. Common findings in Hodgkin lymphoma include enlarged, often painless lymph nodes, sometimes with systemic “B” symptoms such as fever, night sweats, or weight loss.
When to use this code
Use this code when the provider documents Hodgkin lymphoma without a subtype and states the disease involves lymph nodes of the head, face, or neck. It is also appropriate when the record clearly localizes the lymphoma to this nodal region but does not provide more detail. Check documentation if the site or histology is unclear.
Do not use for
Do not use this code for non-Hodgkin lymphoma, unspecified lymphoma, or Hodgkin lymphoma with a different nodal location. If the pathology or note identifies a more specific Hodgkin subtype, code that instead.
Coding tip
Verify both the Hodgkin diagnosis and the documented nodal site before assigning C81.91.