ICD-10 Code C82.51 – Diffuse follicle center lymphoma, lymph nodes of head, face, and neck (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.51 – Diffuse follicle center lymphoma, lymph nodes of head, face, and neck
What it is
This code identifies diffuse follicle center lymphoma involving lymph nodes in the head, face, or neck. Use it when the record specifies this lymphoma subtype and an anatomic site in that region.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include enlarged lymph nodes in the head, face, or neck, with pathology confirming diffuse follicle center lymphoma.
When to use this code
Use C82.51 when the provider documents diffuse follicle center lymphoma and clearly links it to lymph nodes of the head, face, or neck. It is appropriate for confirmed diagnoses in oncology, pathology, or discharge documentation. If the site or subtype is unclear, check documentation before coding.
Do not use for
Do not use this code for unspecified follicular lymphoma, other lymphoma subtypes, or disease in a different nodal region. Check documentation if the record only says “lymphoma” or “lymphadenopathy.”
Coding tip
Code the exact lymphoma subtype and site together; if either element is missing, query the provider.