Placenta percreta, unspecified trimester

This code signifies a severe form of placenta accreta spectrum (PAS) where the placental villi invade through the entire uterine wall and into the serosa, potentially involving adjacent organs. It represents a life-threatening obstetric complication due to the high risk of hemorrhage and organ damage during attempted placental removal.

Apply this code when documentation explicitly states "placenta percreta" without specifying the trimester of pregnancy. This diagnosis is typically made antenatally via imaging (e.g., ultrasound, MRI) or intraoperatively during delivery.

• Ensure the documentation clearly specifies "percreta" and not "accreta" or "increta" for accurate coding.
• This code should be sequenced as a principal diagnosis when it is the primary reason for the admission or encounter.
• Do not use this code if the trimester is known; instead, select the appropriate trimester-specific code (O43.231, O43.232, O43.233).