Granulomatous mastitis, left breast

This code identifies granulomatous inflammation affecting the left breast tissue. It represents a non-infectious inflammatory condition characterized by the formation of granulomas, which are collections of immune cells. This condition can mimic breast cancer clinically and radiologically.

Use this code when documentation explicitly states a diagnosis of granulomatous mastitis localized to the left breast. This diagnosis is typically confirmed via biopsy demonstrating granulomatous inflammation, often after ruling out infectious causes. Documentation should clearly specify the laterality.

• Ensure the documentation specifies "granulomatous" mastitis to differentiate from other forms of mastitis.
• Verify laterality (left breast) is clearly documented; separate codes exist for right, bilateral, and unspecified breasts.
• Do not confuse with infectious mastitis (e.g., N61.0) or other inflammatory breast conditions without granuloma formation.