ICD-10 Code C85.91 – Non-Hodgkin lymphoma, unspecified, lymph nodes of head, face, and neck (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C85.91 – Non-Hodgkin lymphoma, unspecified, lymph nodes of head, face, and neck
What it is
This code identifies non-Hodgkin lymphoma when the type is not specified and the affected lymph nodes are in the head, face, or neck. Use it when documentation names the site but does not identify a more specific lymphoma subtype.
Clinical signs
Findings may include enlarged lymph nodes in the neck or jaw area, sometimes with painless swelling. Clinical features vary; refer to documentation for the exact presentation and pathology details.
When to use this code
Use this code when the record documents non-Hodgkin lymphoma involving lymph nodes of the head, face, or neck and does not specify a more precise histology or site code. It may apply at diagnosis, follow-up, or when the provider has not yet clarified subtype. Check documentation for laterality or more specific anatomic detail if available.
Do not use for
Do not use it if the lymphoma type is specified and another code captures it more accurately. Do not use it for lymph nodes outside the head, face, and neck, or for non-lymphoma malignancies.
Coding tip
Code to the most specific lymphoma type and site documented; if the subtype is missing, use this unspecified code rather than guessing.