Neonatal infective mastitis

This code signifies an inflammatory condition of the breast tissue in a newborn, caused by an infection. It typically presents with localized redness, swelling, warmth, and tenderness of the breast, often accompanied by fever or other signs of systemic infection.

Apply this code when documentation clearly indicates an infection of the mammary gland in a neonate, usually within the first 28 days of life. This diagnosis is supported by physician notes detailing clinical signs of infection and, potentially, laboratory findings such as elevated white blood cell count or positive culture results from breast aspirate.

• Ensure the documentation specifies "neonatal" or "newborn" to differentiate from mastitis in older infants or adults.
• Do not confuse with non-infectious neonatal breast engorgement, which does not involve infection.
• Code any identified causative organism (e.g., Staphylococcus aureus) as an additional diagnosis.