ICD-10 Code C11.0 – Malignant neoplasm of superior wall of nasopharynx (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C11.0 – Malignant neoplasm of superior wall of nasopharynx
What it is
C11.0 identifies a malignant tumor arising in the superior wall of the nasopharynx, the upper part of the throat behind the nose. Use it when the documentation specifies this exact primary site.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings may include nasal obstruction, epistaxis, ear symptoms from eustachian tube blockage, or a neck mass from regional spread.
When to use this code
Use C11.0 when the provider documents a primary cancer of the superior wall of the nasopharynx, or when pathology or imaging clearly localizes the lesion there. If the site is described only as nasopharyngeal, check documentation before assigning this code.
Do not use for
Do not use this code for benign nasopharyngeal lesions, uncertain primary sites, or cancers arising in other parts of the nasopharynx. Check documentation when the record does not specify the superior wall.
Coding tip
Code the exact anatomic site only when it is explicitly documented; otherwise, query for clarification before finalizing the diagnosis code.