Neoplasm of uncertain behavior of mediastinum

This code signifies a tumor located in the mediastinum (the space between the lungs) that cannot definitively be classified as benign or malignant based on current diagnostic information. It indicates that the biological behavior of the neoplasm is currently indeterminate.

Use this code when pathology reports or imaging studies identify a mediastinal mass with features that are neither clearly benign nor clearly malignant. This applies when the physician documents "uncertain behavior," "borderline," or "indeterminate" for a mediastinal neoplasm.

• Requires definitive documentation of "uncertain behavior" for a mediastinal neoplasm; avoid using for suspected but unconfirmed cases.
• Do not use if the neoplasm is clearly documented as benign (e.g., D15.2) or malignant (e.g., C38.x).
• Sequence as the primary diagnosis when the uncertain mediastinal neoplasm is the reason for the encounter.