Matern care for disproprtn d/t unusually large fetus, fts1

This code signifies antenatal care provided to a pregnant patient where the fetus is unusually large, leading to a potential or actual cephalopelvic disproportion (CPD). This disproportion poses a risk for complications during labor and delivery due to the size mismatch between the fetal head/body and the maternal pelvis. The "1" in the code indicates this applies to the first fetus in a multiple gestation or the only fetus.

Use this code when documentation indicates maternal care for a singleton pregnancy or the first fetus in a multiple gestation, where the fetus is identified as unusually large (e.g., macrosomia, large for gestational age) and this size is causing or is expected to cause disproportion. Supporting documentation includes ultrasound reports estimating fetal weight, clinical assessments of fetal size, and provider notes explicitly mentioning disproportion due to an unusually large fetus.

• Ensure documentation clearly links the "unusually large fetus" to the "disproportion."
• Do not use this code if the disproportion is due to a contracted pelvis (O33.0-O33.2) or other maternal causes.
• Always assign an additional code from category Z3A to specify the weeks of gestation.