In simple words: This code indicates that a pregnant woman is receiving care for a birth defect of the uterus during her pregnancy. The specific type of birth defect and the stage of pregnancy are not specified by this code.

This code is used to document maternal care provided for an unspecified congenital malformation of the uterus during an unspecified trimester of pregnancy.It includes scenarios where the malformation necessitates hospitalization, other obstetric care, or cesarean delivery before labor begins.

Example 1: A 25-year-old woman in her second trimester presents for routine prenatal care.Ultrasound reveals a uterine anomaly that is suspected to be congenital but the specific type cannot be determined.The patient is otherwise healthy and the pregnancy is progressing normally. O34.00 is assigned., A 30-year-old pregnant woman in her third trimester with a known uterine malformation is admitted to the hospital for observation due to concerns about premature labor.O34.00 is assigned along with the code for threatened preterm labor., A 35-year-old woman in her first trimester is diagnosed with a bicornuate uterus. Because this is specified malformation, code O34.01, is used instead of O34.00

Documentation should include the type of congenital malformation (if known), the trimester of pregnancy, and any associated complications. Imaging reports (e.g., ultrasound) confirming the diagnosis should also be included.