O91.2 Nonpurulent mastitis associated with pregnancy, the puerperium and lactation

Name of the Condition

• Nonpurulent Mastitis Associated with Pregnancy, the Puerperium and Lactation (O91.2)

Summary

This condition involves inflammation of the breast tissue without the presence of pus, occurring during pregnancy, the postpartum period (puerperium), or while breastfeeding. It may present as breast pain, swelling, or redness and requires evaluation to distinguish it from infectious or other causes of breast inflammation.

Causes

Nonpurulent mastitis typically results from milk stasis, hormonal changes, or mechanical irritation during lactation. 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 pregnancy or postpartum.
• 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 infectious causes (e.g., purulent discharge, fever). Imaging or cultures are typically not required unless symptoms suggest a more severe condition.

Treatment Options

Treatment focuses on relieving inflammation and addressing underlying causes. This may include improved breastfeeding techniques, frequent milk removal, warm compresses, or anti-inflammatory measures. Antibiotics are generally not indicated unless infection is suspected.

Prognosis and Follow-Up

Prognosis is favorable with appropriate management. Symptoms often resolve with conservative measures within a few days. Follow-up may involve monitoring for symptom improvement or progression to ensure no underlying infection develops.

Complications

While rare, untreated nonpurulent mastitis may progress to infectious mastitis or abscess formation. Persistent inflammation could lead to discomfort or reduced milk supply if not addressed.

Lifestyle & Prevention

• Ensure proper breastfeeding technique to prevent nipple trauma.
• Maintain regular milk removal to avoid engorgement.
• Use warm compresses or gentle massage to promote milk flow.
• Wear well-fitting, non-restrictive clothing to reduce irritation.

When to Seek Professional Help

Seek care if symptoms worsen, fever develops, or pus is present, as these may indicate infection. Persistent pain or lack of improvement after 24–48 hours of conservative measures also warrants evaluation.

Tips for Medical Coders

Document the absence of purulent discharge or systemic infection to support the diagnosis. Note clinical findings (e.g., breast tenderness, redness) and any interventions (e.g., lactation support) to confirm the noninfectious nature of the mastitis. Ensure documentation aligns with the clinical presentation to justify the O91.2 code.