ICD-10 Code C85.11 – Unspecified B-cell lymphoma, lymph nodes of head, face, and neck (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C85.11 – Unspecified B-cell lymphoma, lymph nodes of head, face, and neck
What it is
This code identifies a B-cell lymphoma in the lymph nodes of the head, face, or neck when the specific lymphoma type is not documented. Use it when the record confirms B-cell lymphoma but does not name a more precise subtype.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include enlarged cervical or facial lymph nodes, a persistent neck mass, or other signs of lymph node involvement confirmed by pathology or imaging.
When to use this code
Use C85.11 when the provider documents unspecified B-cell lymphoma affecting lymph nodes in the head, face, or neck region and no further subtype is available. This is appropriate for newly diagnosed cases, incomplete pathology reports, or records that do not specify a more exact lymphoma classification.
Choose the most specific lymphoma code if the subtype is documented. If the site is different or the documentation only says lymphoma without B-cell detail, check documentation.
Do not use for
Do not use this code for T-cell lymphomas, Hodgkin lymphoma, or lymphoma in other nodal sites. Do not use it when a more specific B-cell lymphoma diagnosis is documented.
Coding tip
Verify both the cell type and the anatomic site in the pathology or provider note before assigning C85.11.