Mat care chromosomal abnlt in fetus, Trisomy 21, fetus 1

This code signifies ongoing maternal care for a pregnancy where the fetus has been diagnosed with, or is suspected of having, Trisomy 21 (Down syndrome). It specifically applies when the condition affects the first fetus in a multiple gestation or is the only fetus in a singleton pregnancy.

Apply this code when documentation indicates maternal management due to a confirmed or suspected fetal diagnosis of Trisomy 21. This includes scenarios where genetic testing (e.g., amniocentesis, CVS, NIPT) has identified or strongly suggested the chromosomal abnormality.

• Always sequence this code as a secondary diagnosis, following the primary reason for the encounter (e.g., routine prenatal visit).
• Ensure documentation clearly specifies "fetus 1" if applicable, or that it's a singleton pregnancy.
• Do not use for other types of fetal chromosomal abnormalities; specific codes exist for those conditions.