Mammary duct ectasia of left breast

This code describes a non-cancerous condition of the left breast characterized by widening and inflammation of the milk ducts, often leading to periductal mastitis. It can present with nipple discharge, breast pain, or a palpable mass.

Use this code when documentation specifically identifies mammary duct ectasia affecting the left breast. This diagnosis is typically made based on clinical examination, imaging findings (e.g., mammogram, ultrasound), and sometimes biopsy results.

• Ensure laterality is clearly documented; differentiate from right breast (N60.41) or bilateral (N60.43).
• Do not confuse with other benign breast conditions like fibrocystic changes (N60.1-) or intraductal papilloma (D24.-).
• Code any associated symptoms, such as nipple discharge (N64.59) or breast pain (N64.4), as secondary diagnoses if applicable.