Placenta increta, unspecified trimester

This code signifies a severe form of abnormal placental implantation where the chorionic villi invade the myometrium, but do not penetrate through the uterine wall. Placenta increta is a life-threatening obstetric complication associated with significant maternal morbidity and mortality due to potential for massive hemorrhage.

Utilize this code when documentation confirms a diagnosis of placenta increta, and the specific trimester of gestation is not specified. This diagnosis is typically made during or after delivery, often following attempts at manual placental removal or imaging findings.

• Ensure documentation explicitly states "placenta increta" and not just "placenta accreta" or "percreta."
• If the trimester is documented, use the more specific codes (O43.221, O43.222, O43.223).
• Code any associated complications, such as hemorrhage (O46.0- or O46.9-), separately.