Mat care chromsoml abnlt in fetus, sex chromo abnlt, fetus 2

This code indicates that a pregnant patient is receiving medical care due to a suspected or confirmed sex chromosome abnormality in the second fetus of a multiple gestation pregnancy. This includes conditions like Turner syndrome (XO), Klinefelter syndrome (XXY), or other aneuploidies involving the X or Y chromosomes. The "suspected" aspect means that diagnostic testing (e.g., amniocentesis, CVS, NIPT) may be pending or has indicated an increased risk.

Use this code when the medical record documents maternal care for a sex chromosome abnormality identified or suspected in the second fetus. This typically follows abnormal findings from prenatal screening tests (e.g., NIPT, ultrasound markers) or definitive diagnostic tests. Documentation should clearly specify the fetus number and the nature of the suspected abnormality.

• Ensure the medical record specifies "fetus 2" for multiple gestations; otherwise, a different code for a single fetus or unspecified fetus would be appropriate.
• This code is for maternal care; the fetal condition itself would be coded separately if applicable to the newborn record.
• Always sequence this code as a secondary diagnosis following the appropriate code for the pregnancy (e.g., O30.0-, O30.1-).