In simple words: This code is used when a pregnant woman carrying quadruplets receives care during the first three months of pregnancy because the fourth baby's heartbeat is irregular or abnormal.

This code describes maternal care received due to abnormalities detected in the fetal heart rate or rhythm during the first trimester of pregnancy, specifically for the fourth fetus in a multiple gestation pregnancy.

Example 1: A pregnant woman at 12 weeks gestation, carrying quadruplets, undergoes an ultrasound that reveals an irregular heart rhythm in the fourth fetus.The physician provides additional monitoring and care due to this finding., A woman pregnant with quadruplets presents at 10 weeks gestation with concerns about reduced fetal movement. An ultrasound shows abnormal heart rate patterns in the fourth fetus, prompting closer monitoring and further investigation by the obstetrician., During a routine prenatal visit at 13 weeks, a woman pregnant with quadruplets undergoes fetal heart rate monitoring. The fourth fetus exhibits a sustained bradycardia. The physician admits the mother for observation and management of the abnormal fetal heart rate.

Documentation should include details of the abnormal fetal heart rate or rhythm (e.g., bradycardia, tachycardia, arrhythmia), the method of detection (e.g., ultrasound, fetal monitoring), and any associated maternal or fetal signs or symptoms. The trimester of pregnancy and the number of fetuses should also be clearly documented.

** It is important to differentiate this code, which refers to care provided to the mother due to the fetal condition, from codes that describe the fetal condition itself.