ICD-10 Code C86.0 – Extranodal NK/T-cell lymphoma, nasal type (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C86.0 – Extranodal NK/T-cell lymphoma, nasal type
What it is
C86.0 identifies extranodal NK/T-cell lymphoma, nasal type, a rare aggressive lymphoma that usually starts outside lymph nodes, often in the nasal cavity. Use it when the record specifically names this diagnosis.
Clinical signs
Common findings include nasal obstruction, epistaxis, facial swelling, or destructive lesions in the upper airway. Clinical features vary; refer to documentation for the confirmed site and pathology.
When to use this code
Use C86.0 when the provider documents extranodal NK/T-cell lymphoma, nasal type, or a synonymous term. It may also apply when pathology confirms this specific lymphoma and the nasal or upper aerodigestive tract origin is documented. Check documentation if the site or subtype is unclear.
Do not use for
Do not use this code for other non-Hodgkin lymphomas, T-cell lymphomas, or nasal masses without confirmed lymphoma. If the record only says “lymphoma” or gives a different subtype, code the documented diagnosis instead.
Coding tip
Verify the exact histologic subtype and anatomic description before assigning C86.0.