Mat care chromosomal abnormality in fetus, Trisomy 21, unsp

This code signifies maternal care provided when a fetus is suspected or confirmed to have Trisomy 21 (Down syndrome). It specifically addresses the maternal health services related to managing a pregnancy complicated by this chromosomal abnormality. The "not applicable or unspecified" character indicates that further specification regarding the type of care or the specific trimester is not provided or not relevant.

Use this code for pregnancies where prenatal screening (e.g., NIPT, quad screen) or diagnostic testing (e.g., amniocentesis, CVS) indicates a high probability or definitive diagnosis of Trisomy 21 in the fetus. It applies to maternal care encounters focused on monitoring, counseling, or planning for a pregnancy affected by fetal Down syndrome. Documentation should clearly state the suspicion or diagnosis of fetal Trisomy 21 and the maternal care provided.

• Always sequence this code as a secondary diagnosis, following the code for the primary reason for the encounter (e.g., routine prenatal visit).
• Do not use this code if the chromosomal abnormality is definitively identified as something other than Trisomy 21; refer to other O35.1 subcategories.
• Ensure documentation specifies "Trisomy 21" or "Down syndrome" in the fetal diagnosis to support the use of this specific code.