In simple words: This code indicates that a pregnant woman, less than 14 weeks pregnant, is receiving specialized care due to a birth defect affecting the shape or structure of her uterus.

This ICD-10-CM code is used for documenting maternal care provided during the first trimester (less than 14 weeks) of pregnancy when the mother has an unspecified congenital malformation of the uterus. This code is used on the maternal record, not the newborn's record, and covers care related to or aggravated by the pregnancy due to the uterine malformation.It includes the condition as a reason for hospitalization, other obstetric care, or cesarean delivery before the onset of labor.Any associated obstructed labor should be coded separately (O65.5), and an additional code should be used to identify the specific week of gestation (Z3A.-).

Example 1: A 28-year-old woman presents for her first prenatal visit at 10 weeks gestation.An ultrasound reveals a bicornuate uterus (two-horned uterus).She receives counseling regarding the risks associated with this condition and a plan for closer monitoring throughout the pregnancy. O34.01 is coded., A 32-year-old woman with a known uterine septum (a wall dividing the uterus) is seen at 12 weeks gestation. She has a history of recurrent miscarriages. The physician recommends cerclage placement (a stitch to keep the cervix closed) to prevent preterm delivery. O34.01 is coded for the uterine malformation and the associated maternal care.An additional code is needed for the cerclage., A 35-year-old woman at 8 weeks gestation is found to have a unicornuate uterus (a uterus with only one horn).She undergoes regular ultrasounds to assess fetal growth and development.O34.01 is coded.

Documentation should clearly state the type of congenital uterine malformation, gestational age, and the need for specialized care due to this condition. Any related complications should also be noted.