Benign neoplasm of nasal cavities, middle ear, and accessory sinuses

This code signifies the presence of a non-cancerous growth originating within the nasal passages, paranasal sinuses, or the middle ear cavity. These benign neoplasms are typically slow-growing and do not metastasize, but can cause symptoms due to their mass effect or obstruction. Examples include osteomas, chondromas, or papillomas in these specific anatomical locations.

Apply this code when documentation clearly identifies a benign tumor located in the nasal cavity, any of the paranasal sinuses (frontal, maxillary, ethmoid, sphenoid), or the middle ear. Supporting documentation includes pathology reports confirming benign histology, imaging studies (CT, MRI) demonstrating a well-circumscribed, non-invasive mass, and physician notes detailing the location and benign nature of the lesion.

• Ensure the documentation explicitly states "benign neoplasm" and specifies one of the listed anatomical sites.
• Differentiate from malignant neoplasms of these sites, which are coded to the 160 series.
• Do not use for polyps, which have their own specific codes (e.g., 471.x for nasal polyps).