Mat care chromosomal abnlt in fetus, Trisomy 18, fetus 1

This code signifies maternal care provided due to a suspected or confirmed diagnosis of Trisomy 18 (Edwards Syndrome) in the first fetus of a multiple gestation pregnancy. It indicates that the mother is receiving specialized monitoring and management because of this specific chromosomal anomaly detected in her unborn child.

Use this code when documentation indicates maternal care for a fetus diagnosed with or highly suspected of having Trisomy 18. This typically arises from abnormal prenatal screening tests (e.g., NIPT, quad screen) or diagnostic procedures like amniocentesis or chorionic villus sampling (CVS) confirming the chromosomal abnormality.

• Ensure documentation specifies "fetus 1" when coding for multiple gestations.
• Do not use this code if the chromosomal abnormality is definitively ruled out.
• Sequence this code as a secondary diagnosis following the primary reason for the encounter, if applicable.