Prolonged pregnancy

This code signifies a pregnancy that has extended beyond the expected due date, typically defined as 42 completed weeks of gestation (294 days or more from the last menstrual period). It indicates a post-term pregnancy, which can carry increased risks for both the mother and the fetus.

Assign this code when documentation clearly indicates a gestation of 42 weeks or more. This diagnosis is often made during prenatal visits or at the time of delivery when the gestational age exceeds the normal range. Supporting documentation includes gestational age calculations based on LMP, ultrasound, or other clinical assessments.

• Do not use this code for post-dates pregnancy (gestation between 40 weeks 0 days and 41 weeks 6 days); use O48.0 for those cases.
• Always sequence this code as a secondary diagnosis when a delivery occurs, with the outcome of delivery (Z37.x) as the primary.
• Ensure the medical record explicitly states "prolonged pregnancy" or "post-term pregnancy" with a gestational age of 42 weeks or greater.