Malig neoplasm of lower-outer quadrant of unsp female breast

This code signifies a primary cancerous tumor located in the lower-outer quadrant of an unspecified female breast. It indicates the presence of a malignant growth originating in this specific region of the breast, without further specification of laterality (left or right).

Apply this code when documentation confirms a primary malignant neoplasm in the lower-outer quadrant of a female breast, and the medical record does not specify whether it is the left or right breast. This is appropriate for initial diagnoses or when laterality is unknown or unstated.

• Ensure the documentation explicitly states "lower-outer quadrant" and "female breast."
• Do not use this code if laterality (left or right breast) is documented; instead, select a more specific code (e.g., C50.511 or C50.512).
• This code represents a primary malignancy; use secondary malignancy codes (C79.81) for metastatic breast cancer.