Gestational interstitial mastitis
Gestational lymphangitis of breast
Gestational mastitis NOS
Gestational parenchymatous mastitis
O91.21 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
The 2023 edition of ICD-10-CM O91.21 became effective on October 1, 2022.
This is the American ICD-10-CM version of O91.21 – other international versions of ICD-10 O91.21 may differ.