ICD-10 Code C30 – Malignant neoplasm of nasal cavity and middle ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C30 – Malignant neoplasm of nasal cavity and middle ear
What it is
C30 identifies a malignant tumor arising in the nasal cavity or middle ear. Use it when the record documents primary cancer in either site, without a more specific subsite code.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include unilateral nasal obstruction, epistaxis, ear fullness, hearing loss, or a visible mass, but you should code only what is documented.
When to use this code
Use C30 when the provider states malignant neoplasm of the nasal cavity or middle ear and no further anatomic detail is available. It may also apply when the site is confirmed by pathology or imaging and documented as primary cancer. Check documentation if the record does not clearly identify the site.
Do not use for
Do not use C30 for benign tumors, inflammatory disease, or nonmalignant nasal or ear conditions. If the cancer is described at a more specific nearby site, code that specific diagnosis instead.
Coding tip
Confirm the exact primary site in the pathology or operative note before assigning C30.