Malig neoplasm of lower-outer quadrant of left female breast

This code identifies a primary cancerous tumor originating in the lower-outer quadrant of the left breast in a female patient. This specific anatomical location is often referred to as the inferolateral quadrant. It signifies a confirmed diagnosis of malignancy, not a benign or uncertain mass.

Apply this code when documentation explicitly states a primary malignant neoplasm located in the lower-outer quadrant of the left female breast. This is typically supported by pathology reports confirming malignancy and imaging studies (e.g., mammogram, MRI) or surgical notes specifying the tumor's precise location within the breast.

• Ensure the laterality (left) and specific quadrant (lower-outer) are clearly documented.
• Do not use this code for carcinoma in situ; use the appropriate D05.- code.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any relevant secondary diagnoses such as metastatic sites.