ICD-10 Code C82.91 – Follicular lymphoma, unspecified, lymph nodes of head, face, and neck (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.91 – Follicular lymphoma, unspecified, lymph nodes of head, face, and neck
What it is
C82.91 identifies follicular lymphoma when the site is the lymph nodes of the head, face, or neck and the subtype is not further specified. Use it for a documented lymphoma diagnosis limited to these nodal regions.
Clinical signs
Typical findings include enlarged, usually painless lymph nodes in the neck or nearby head and facial regions. Clinical features vary; refer to documentation for pathology confirmation and the exact nodal site.
When to use this code
Use this code when the provider documents follicular lymphoma involving lymph nodes of the head, face, or neck without a more specific subtype. It also fits when the record names the nodal site but does not identify another qualifying location.
If the note later specifies a different anatomic site or a more detailed follicular lymphoma category, code that documented detail instead. Check documentation when the record is incomplete or ambiguous.
Do not use for
Do not use it for follicular lymphoma in other lymph node regions or for non-follicular lymphomas. Do not assign it when the diagnosis is only suspected or when documentation points to a different disease.
Coding tip
Confirm both the lymphoma type and the nodal location in the pathology or oncology note before selecting C82.91.