39 weeks gestation of pregnancy

This code signifies that a pregnancy has reached 39 completed weeks of gestation. It indicates the current gestational age of the fetus, typically calculated from the first day of the last menstrual period (LMP) or by early ultrasound.

This code is used to document the gestational age of a pregnancy when the patient is exactly 39 weeks pregnant. It is frequently applied during prenatal visits, hospital admissions for labor and delivery, or for any medical encounter where the precise gestational age needs to be recorded.

• Always confirm the gestational age documentation from the physician or medical record.
• Do not use this code if the gestation is 39 weeks and one day or more; a different Z3A code would be appropriate.
• This code is typically a secondary diagnosis, accompanying codes for the pregnancy itself (e.g., O codes).