O91.219 Nonpurulent mastitis associated with pregnancy, unspecified trimester

Name of the Condition

• Nonpurulent Mastitis Associated with Pregnancy, Unspecified Trimester (O91.219)

Summary

This condition involves inflammation of the breast tissue during pregnancy that is not associated with pus formation, occurring in an unspecified trimester. It may present with localized pain, swelling, or redness and requires evaluation to distinguish from infectious causes. Management focuses on symptom relief and monitoring for progression.

Causes

Nonpurulent mastitis during pregnancy is often linked to hormonal changes, milk duct engorgement, or mechanical irritation. Unlike purulent forms, it typically lacks bacterial infection, though inflammation may still occur due to milk stasis or tissue trauma.

Risk Factors

• Hormonal fluctuations in pregnancy.
• Engorgement or blocked milk ducts.
• Previous breast inflammation.
• Mechanical irritation from clothing or activity.

Symptoms

• Breast pain, tenderness, or swelling.
• Redness or warmth in the affected area.
• Mild systemic symptoms (e.g., low-grade fever).
• Absence of pus or significant discharge.

Diagnosis

Diagnosis is clinical, based on physical examination and symptom assessment. Cultures are generally not required unless infection is suspected. Imaging (e.g., ultrasound) may be used to rule out abscess or other complications.

Treatment Options

• Warm compresses to relieve discomfort.
• Gentle breast massage to improve milk flow.
• Supportive care, including rest and hydration.
• Pain relief as needed (e.g., acetaminophen).
• Monitoring for signs of infection or progression.

Prognosis and Follow-Up

Most cases resolve with conservative management, but follow-up is important to ensure symptoms improve and to rule out progression to infection or abscess. Patients should be advised to seek care if symptoms worsen or persist.

Complications

• Progression to purulent mastitis or breast abscess.
• Persistent pain or discomfort.
• Rarely, systemic infection if left untreated.

Lifestyle & Prevention

• Ensure proper breast support with well-fitting clothing.
• Practice gentle breast care to avoid irritation.
• Maintain good hydration and rest.
• Address engorgement promptly to reduce inflammation risk.

When to Seek Professional Help

Seek care if symptoms worsen, fever develops, pus is present, or pain becomes severe. Persistent redness, swelling, or systemic symptoms also warrant evaluation.

Tips for Medical Coders

Document the trimester as "unspecified" when the medical record does not specify the pregnancy trimester. Ensure clinical documentation supports the absence of purulent (pus-forming) infection to justify this code.