Mat care chromosomal abnlt in fetus, Trisomy 21, fetus 5

This code signifies ongoing maternal medical care and surveillance due to a suspected or confirmed diagnosis of Trisomy 21 (Down syndrome) in the fifth fetus of a multiple gestation pregnancy. It indicates that the mother is receiving specialized obstetric management specifically because of this fetal chromosomal abnormality.

Use this code when the medical record documents maternal care for a fetus diagnosed with, or highly suspected of having, Trisomy 21. This typically follows abnormal prenatal screening results (e.g., NIPT, quad screen) or diagnostic testing (e.g., amniocentesis, CVS) confirming the condition in the fifth fetus. Documentation should clearly specify the affected fetus in a multiple gestation.

• Ensure the medical record explicitly identifies "fetus 5" as the one with the suspected or confirmed Trisomy 21.
• This code is for maternal care; a separate code for the fetal condition itself (e.g., Q90.9) would be used on the infant's record after birth.
• Always sequence this code as a secondary diagnosis following the primary reason for the encounter, if applicable, or as the primary diagnosis if the encounter is solely for management of this condition.