Placenta percreta, third trimester

This code signifies a severe form of placental adherence where the placental villi invade through the entire uterine wall and into surrounding organs, such as the bladder or bowel, during the third trimester of pregnancy. It represents the most invasive type of morbidly adherent placenta, posing significant risks of hemorrhage and maternal morbidity.

Apply this code when documentation explicitly states placenta percreta in a patient who is in her third trimester of pregnancy. Supporting documentation would include ultrasound reports, MRI findings, surgical notes from a hysterectomy performed due to intractable hemorrhage, or pathology reports confirming the depth of placental invasion.

• Ensure the documentation specifies "percreta" and not "accreta" or "increta," as these are distinct conditions with different codes.
• Confirm the gestational age falls within the third trimester (28 weeks 0 days to delivery).
• Always sequence this code as a secondary diagnosis following the appropriate code for the outcome of delivery (e.g., O80-O82) or the primary reason for the encounter if delivery has not yet occurred.