In simple words: This code is for breast inflammation (swelling and pain) that happens while breastfeeding but without an infection causing pus.It's a complication that can occur after childbirth.

This code classifies nonpurulent mastitis (inflammation of the breast tissue without pus formation) specifically occurring in association with lactation (breastfeeding).It is a complication that can arise during the postpartum period.The diagnosis requires clinical evaluation and may be supported by imaging studies if needed.

Example 1: A 32-year-old woman, one week postpartum, presents with breast pain, swelling, and redness in her right breast.She is breastfeeding and reports difficulty with latch. Examination reveals localized breast inflammation without fluctuance (pus).O91.23 is coded., A 28-year-old woman, six weeks postpartum, reports breast tenderness and engorgement.She is breastfeeding successfully, but experiences localized discomfort.Examination shows minimal erythema and no evidence of infection. O91.23 is coded., A 35-year-old woman, three weeks postpartum, presents with localized breast pain and swelling in her left breast. She is exclusively breastfeeding.Physical examination shows induration and tenderness without fluctuation. Ultrasound confirms the absence of an abscess.O91.23 is coded.

Detailed history of the patient's pregnancy and postpartum course, including breastfeeding practices.Complete physical examination of the breasts, noting location, size, tenderness, erythema, and presence or absence of fluctuance (pus).Imaging findings if any (ultrasound to rule out abscess).

** Differentiation between O91.23 and other related codes (O91.21, O91.22, O91.13) requires careful clinical judgment based on the timing of mastitis in relation to pregnancy and childbirth.