Neoplasm of uncertain behavior of pharynx

This code signifies the presence of an abnormal growth within the pharynx where the pathologist cannot definitively classify it as benign or malignant. The cellular characteristics suggest a neoplastic process, but there is insufficient evidence to determine its biological behavior with certainty.

Apply this code when pathology reports describe a pharyngeal lesion as "atypical," "uncertain neoplastic potential," or "indeterminate neoplasm." This is appropriate when the physician suspects a tumor, but the final pathology has not confirmed malignancy or benignity.

• Ensure the documentation explicitly states "uncertain behavior" or similar terminology for a pharyngeal neoplasm.
• Do not use this code if the pathology definitively identifies the neoplasm as benign (e.g., D10.4) or malignant (e.g., C10.9).
• Specify the subsite of the pharynx (e.g., nasopharynx, oropharynx, hypopharynx) if documented, as more specific codes may be available.