Neoplasm of uncertain behavior of larynx

This code signifies a laryngeal lesion where the pathologist cannot definitively determine if it is benign or malignant after microscopic examination. It represents an abnormal growth in the voice box that exhibits some atypical features but lacks clear evidence of invasion or metastasis. Further diagnostic workup, such as repeat biopsy or close observation, is typically warranted.

Assign this code when pathology reports describe a laryngeal neoplasm as "uncertain," "borderline," or "of undetermined malignant potential." Documentation must explicitly state the uncertain nature of the tumor's behavior, often following an initial biopsy or excision. This code is appropriate when the physician is awaiting further diagnostic clarity.

• Do not use this code if the pathology report definitively states benign or malignant; use the appropriate benign or malignant neoplasm code instead.
• Ensure the documentation specifies the larynx as the anatomical site; otherwise, an unspecified site code for uncertain behavior would be more appropriate.
• This code is often a temporary assignment pending definitive diagnosis; update the code once a final pathology report is available.