O91.211 Nonpurulent mastitis associated with pregnancy, first trimester

Name of the Condition

• Nonpurulent Mastitis Associated with Pregnancy, First Trimester (O91.211)

Summary

This condition involves inflammation of the breast tissue during the first trimester of pregnancy that is not associated with pus formation. It may present with localized pain, swelling, or redness and requires evaluation to rule out infectious causes or other complications. Management focuses on symptom relief and monitoring for progression.

Causes

Nonpurulent mastitis in early pregnancy may result from hormonal changes affecting breast tissue, milk duct dilation, or mechanical irritation. Unlike purulent mastitis, it typically lacks bacterial infection, though inflammation can still occur due to tissue stress or ductal changes.

Risk Factors

• Hormonal fluctuations in early pregnancy.
• Pre-existing breast tissue sensitivity.
• History of breast changes during prior pregnancies.
• Mechanical pressure from clothing or activity.

Symptoms

• Breast pain, tenderness, or soreness.
• Mild swelling or firmness in the breast.
• Localized redness or warmth.
• Absence of fever or systemic symptoms (distinguishes from purulent infection).

Diagnosis

Diagnosis is clinical, based on history and physical examination. Providers assess for signs of infection (e.g., fever, pus) and may use imaging (e.g., ultrasound) to rule out abscess or other pathology. Labs are typically unnecessary unless infection is suspected.

Treatment Options

Treatment focuses on symptom management, including:

• Warm or cold compresses to reduce discomfort.
• Supportive care (e.g., rest, proper bra fit).
• Monitoring for worsening symptoms or signs of infection.
• Avoidance of unnecessary antibiotics unless infection is confirmed.

Prognosis and Follow-Up

Most cases resolve with conservative management. Follow-up ensures symptoms do not progress to infection or other complications. If symptoms worsen or persist, reevaluation for alternative causes is recommended.

Complications

• Progression to purulent mastitis or abscess if infection develops.
• Persistent breast discomfort affecting daily activities.
• Rarely, tissue damage from untreated inflammation.

Lifestyle & Prevention

• Wear well-fitting, supportive bras to reduce irritation.
• Avoid excessive breast manipulation or pressure.
• Monitor for changes and report new symptoms promptly.

When to Seek Professional Help

Seek care if symptoms worsen, fever develops, or pus is present, as these may indicate infection requiring antibiotics. Persistent pain or swelling beyond a few days also warrants evaluation.

Tips for Medical Coders

Document the trimester (first) and confirm the absence of purulent discharge or infection to justify the nonpurulent classification. Include clinical notes supporting the absence of systemic infection signs (e.g., fever, pus) to align with code specificity.