ICD-10 Code C11.2 – Malignant neoplasm of lateral wall of nasopharynx (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C11.2 – Malignant neoplasm of lateral wall of nasopharynx
What it is
C11.2 identifies a malignant tumor arising in the lateral wall of the nasopharynx. Use it when the documentation specifies this exact anatomic site.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings may include nasal obstruction, epistaxis, ear symptoms, or a visible nasopharyngeal mass confirmed on examination or imaging.
When to use this code
Use C11.2 when the provider documents primary cancer of the lateral wall of the nasopharynx. This code fits pathology, endoscopy, or imaging reports that clearly localize the malignancy to that site.
If the record only says “nasopharyngeal cancer” without a subsite, check documentation before assigning a more specific code. Code the documented primary site, not the symptom or the biopsy procedure.
Do not use for
Do not use C11.2 for benign nasopharyngeal lesions, metastatic disease to the nasopharynx, or unspecified nasopharyngeal malignancy. Check documentation.
Coding tip
When the subsite is unclear, query for the exact nasopharyngeal location before coding.