Neoplasm of uncertain behavior of other and unspecified endocrine glands

This code signifies a tumor of an endocrine gland where the pathologist cannot definitively determine if it is benign or malignant. It indicates that the cellular characteristics are ambiguous, preventing a clear classification of the neoplasm's biological behavior. This uncertainty necessitates further investigation or monitoring.

This code is appropriate when pathology reports describe a neoplasm of an endocrine gland (e.g., adrenal, parathyroid, pineal, thymus) as "uncertain behavior," "borderline malignancy," or "indeterminate." It should be used when the documentation explicitly states that the tumor's nature is not yet definitively benign or malignant.

• Ensure the documentation specifies an endocrine gland other than the thyroid, pancreas, or ovary, as those have more specific codes for uncertain behavior.
• Avoid using this code if the pathology report clearly states "benign" or "malignant"; use the appropriate benign or malignant neoplasm code instead.
• This code requires a definitive pathological diagnosis of "uncertain behavior"; clinical suspicion alone is insufficient.