Malignant inflammatory neoplasm of unspecified breast

This code signifies a highly aggressive form of breast cancer characterized by rapid onset, inflammation, and often a diffuse, edematous appearance of the breast without a palpable mass. It represents a malignant neoplasm where the inflammatory features are a predominant clinical characteristic, indicating advanced disease.

Use this code when documentation explicitly states "inflammatory breast cancer" and the laterality of the affected breast is not specified. This diagnosis is typically supported by biopsy confirming malignancy and clinical findings consistent with inflammation, such as erythema, edema, and peau d'orange appearance.

• Do not use this code if the laterality (left, right, bilateral) of the inflammatory breast cancer is documented; instead, select a more specific code.
• Ensure the pathology report confirms malignancy; "inflammatory changes" alone are insufficient for this diagnosis.
• Sequence this code as the primary diagnosis when it is the reason for the encounter or treatment.