Matern care for abnlt fetl hrt rate or rhym, 3rd tri, fts1

This code signifies ongoing maternal medical supervision and intervention due to an irregular or abnormal heart rate or rhythm detected in the first fetus during the third trimester of pregnancy. This includes conditions like fetal bradycardia, tachycardia, or arrhythmias requiring monitoring and potential management.

Apply this code when documentation indicates maternal care for a diagnosed abnormality of the fetal heart rate or rhythm in the third trimester, specifically for the first fetus. Supporting documentation includes fetal heart rate monitoring strips, ultrasound reports noting arrhythmias, or physician notes detailing the abnormal fetal heart rate and subsequent maternal management.

• Ensure the documentation clearly specifies "fetus 1" when multiple gestations are present.
• Confirm the abnormality was identified and managed during the third trimester (28 weeks gestation to delivery).
• Sequence this code as a secondary diagnosis following the primary obstetric complication or condition, if applicable.