O91.22 Nonpurulent mastitis associated with the puerperium

Name of the Condition

• Nonpurulent Mastitis Associated with the Puerperium (O91.22)

Summary

This condition involves inflammation of the breast tissue without pus formation, occurring during the puerperium (postpartum period). It may present with breast pain, swelling, or redness and requires evaluation to distinguish from infectious causes. Management focuses on symptom relief and monitoring for progression.

Causes

Nonpurulent mastitis in the puerperium typically results from milk stasis, hormonal changes, or mechanical irritation. Unlike purulent mastitis, it does not involve bacterial infection or pus formation. Factors like incomplete milk removal, engorgement, or nipple trauma may contribute to inflammation without overt infection.

Risk Factors

• Inadequate milk removal or engorgement.
• Nipple trauma or irritation.
• Hormonal fluctuations during the postpartum period.
• Previous episodes of breast inflammation.
• Poor breastfeeding technique or positioning.

Symptoms

• Breast pain, tenderness, or swelling.
• Redness or warmth of the breast tissue.
• Generalized breast discomfort without systemic fever.
• Absence of pus or discharge.
• Possible nipple sensitivity or irritation.

Diagnosis

Diagnosis is clinical, based on symptoms and physical examination. Providers assess for signs of inflammation (e.g., redness, swelling) and rule out infection by evaluating for fever or pus. Cultures are generally not required unless infection is suspected. Imaging (e.g., ultrasound) may be used to exclude abscess or other complications.

Treatment Options

• Warm compresses to relieve discomfort.
• Gentle breast massage to improve milk flow.
• Proper breastfeeding technique or pumping to ensure complete milk removal.
• Pain relief medications (e.g., acetaminophen) as needed.
• Continued monitoring for signs of infection.

Prognosis and Follow-Up

Most cases resolve with conservative management, such as improved milk removal and supportive care. Follow-up is recommended to ensure symptoms improve and to monitor for progression to infection or other complications. If symptoms worsen or persist, further evaluation may be necessary.

Complications

• Progression to purulent (infectious) mastitis if bacteria enter the inflamed tissue.
• Abscess formation (rare but possible if infection develops).
• Persistent breast pain or discomfort if milk stasis continues.

Lifestyle & Prevention

• Ensure regular and complete milk removal through breastfeeding or pumping.
• Use proper breastfeeding positioning to avoid nipple trauma.
• Wear loose-fitting, supportive bras to reduce irritation.
• Apply warm compresses before feeding to promote milk flow.
• Maintain good hygiene to minimize infection risk.

When to Seek Professional Help

Seek care if symptoms worsen (e.g., fever, pus, severe pain), if redness spreads, or if there is no improvement after 24–48 hours of home care. Prompt evaluation is important to rule out infection or abscess.

Tips for Medical Coders

Document the presence of breast inflammation without pus, the postpartum context, and any contributing factors (e.g., milk stasis, trauma). Ensure the clinical note specifies nonpurulent mastitis to support the O91.22 code. Differentiate from purulent mastitis or other breast conditions to avoid miscoding.