Mat care chromosomal abnlt in fetus, unspecified, fetus 4

This code signifies a pregnancy where the mother is receiving care due to a suspected or confirmed chromosomal abnormality in the fetus. The specific type of chromosomal abnormality is not documented, and this code applies to the fourth fetus in a multiple gestation pregnancy.

Assign this code when documentation indicates maternal management for a fetal chromosomal issue, such as an abnormal prenatal genetic screening result (e.g., NIPT, quad screen) or an ultrasound finding suggestive of a chromosomal disorder, but the specific anomaly is not yet identified or confirmed. This code is specifically for the fourth fetus in a multifetal pregnancy.

• Ensure the documentation clearly states "suspected" or "confirmed" chromosomal abnormality and specifies it pertains to the fourth fetus.
• Do not use this code if a specific chromosomal abnormality (e.g., Down syndrome, Trisomy 18) has been definitively diagnosed; instead, use the more specific O35.1xx codes.
• Always sequence this code as a principal diagnosis when it is the primary reason for the encounter, followed by any relevant codes for the specific findings or interventions.