Neoplasm of uncertain behavior of thyroid gland

This code signifies a tumor of the thyroid gland where the pathologist cannot definitively determine if it is benign or malignant based on current microscopic examination. It indicates an intermediate stage of neoplasm, requiring further investigation or monitoring.

Use this code when pathology reports describe a thyroid lesion as "uncertain behavior," "borderline malignancy," or "of unknown malignant potential." Documentation must explicitly state the pathologist's inability to classify the neoplasm as either benign or malignant.

• Do not use this code if the pathology report definitively states benign (e.g., adenoma) or malignant (e.g., carcinoma).
• Ensure the documentation specifies the thyroid gland as the primary site of the uncertain neoplasm.
• Consider sequencing this code as the primary diagnosis when the uncertain behavior of the thyroid neoplasm is the reason for the encounter.