Malig neoplasm of upper-outer quadrant of left male breast

This code signifies a cancerous tumor located in the upper-outer quadrant of the left breast in a male patient. It specifies the malignancy's primary site and laterality within the breast tissue. This diagnosis indicates the presence of an abnormal, uncontrolled growth of cells requiring further investigation and treatment.

Apply this code when documentation clearly states a primary malignant neoplasm originating in the upper-outer quadrant of the left breast in a male. This is typically supported by pathology reports confirming malignancy and imaging studies (e.g., mammogram, MRI) localizing the tumor. Use this code for initial diagnosis and subsequent encounters related to the primary tumor.

• Ensure the documentation explicitly states "male breast" to differentiate from female breast cancer codes.
• Verify the specific quadrant (upper-outer) and laterality (left) are clearly documented; do not assume.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any relevant secondary diagnoses or complications.