Encounter for antenatal screening for chromosomal anomalies

This code signifies a patient's visit specifically for screening tests performed during pregnancy to assess the risk of the fetus having a chromosomal abnormality, such as Down syndrome (Trisomy 21), Edwards syndrome (Trisomy 18), or Patau syndrome (Trisomy 13). These screenings are typically non-invasive and aim to identify pregnancies that may benefit from further diagnostic testing.

Apply this code when a pregnant patient undergoes procedures like nuchal translucency ultrasound, maternal serum screening (e.g., quad screen), or non-invasive prenatal testing (NIPT) to evaluate for chromosomal anomalies. It is appropriate for routine prenatal care visits where these specific screening tests are performed or ordered.

• This code is for screening purposes only; do not use it if a chromosomal anomaly has already been diagnosed.
• Always sequence this code as the primary diagnosis when the sole reason for the encounter is antenatal screening for chromosomal anomalies.
• Consider additional codes for any abnormal findings or if definitive diagnostic procedures (e.g., amniocentesis, CVS) are subsequently performed.