Matern care for abnlt fetl hrt rate or rhym, unsp tri, fts2

This code signifies medical attention provided to a pregnant patient due to an irregular or abnormal heart rate or rhythm detected in the second fetus of a multiple gestation pregnancy. This includes conditions such as fetal bradycardia, tachycardia, or arrhythmias that require monitoring or intervention, where the specific trimester of detection is not documented.

Apply this code when documentation indicates maternal care for an abnormal fetal heart rate or rhythm in fetus 2, and the medical record does not specify the trimester during which the abnormality was identified. This is typically supported by obstetrician notes, fetal monitoring strips, or ultrasound reports detailing the cardiac anomaly in the second twin.

• Ensure the documentation clearly identifies the abnormality as pertaining to the second fetus in a multiple gestation.
• Avoid using this code if the trimester is known; instead, select the appropriate trimester-specific code (e.g., O36.8312, O36.8322, O36.8332).
• Always sequence this code as a secondary diagnosis following the code for the primary reason for the encounter, if applicable.