Neoplasm of uncertain behavior of larynx

This diagnosis code signifies the presence of an abnormal growth within the larynx where the pathologist cannot definitively determine if it is benign or malignant. This means the cellular characteristics are ambiguous, preventing a clear classification as either non-cancerous or cancerous.

Use this code when pathology reports describe a laryngeal lesion as "uncertain behavior," "borderline malignancy," or "indeterminate." This code is appropriate when the physician suspects a neoplasm but definitive benign or malignant characteristics are not yet established through biopsy or other diagnostic studies.

• Ensure the pathology report explicitly states "uncertain behavior" or similar terminology for a laryngeal neoplasm.
• Carefully review the "Excludes1" notes to avoid co-coding with neoplasms of uncertain behavior in specific aryepiglottic fold regions.
• If a definitive diagnosis of benign or malignant is later established, update the diagnosis code accordingly.