ICD-10 Code C86.00 – Extranodal NK/T-cell lymphoma, nasal type not having achieved remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C86.00 – Extranodal NK/T-cell lymphoma, nasal type not having achieved remission
What it is
C86.00 identifies extranodal NK/T-cell lymphoma, nasal type, when the disease has not achieved remission. Use it for an active lymphoma involving the nasal area or nearby extranodal sites, documented as persistent or not in remission.
Clinical signs
Typical findings include nasal obstruction, epistaxis, facial swelling, or destructive lesions in the upper aerodigestive tract. Clinical features vary; refer to documentation and pathology confirming extranodal NK/T-cell lymphoma, nasal type.
When to use this code
Use this code when the provider documents extranodal NK/T-cell lymphoma, nasal type, and specifically states the patient has not achieved remission. It may apply during initial diagnosis, persistent disease, or relapse if the record does not describe remission. Check oncology notes for exact disease status.
Do not use for
Do not use C86.00 if the lymphoma is documented as in remission, in remission unspecified, or if the diagnosis is a different lymphoma subtype. Check documentation when the site or histology is unclear.
Coding tip
Match the code to both the histologic type and remission status; if either is missing, query the clinician.