BY4 Ultrasonography - Fetus and Obstetrical ICD-10-PCS
The BY4 code range contains 9 ICD-10-PCS codes for Ultrasonography procedures on the fetus and obstetrical. 8 of the codes are billable and valid for inpatient claim submission in fiscal year 2027.
Root Operation Definition
Ultrasonography: Real time display of images of anatomy or flow information developed from the capture of reflected and attenuated high frequency sound waves.
Codes in the BY4 Range 9 codes · 8 billable
- BY4 Imaging, Fetus and Obstetrical, UltrasonographyNon-billable header
- BY47ZZZ Ultrasonography of Fetal Umbilical Cord
- BY48ZZZ Ultrasonography of Placenta
- BY49ZZZ Ultrasonography of First Trimester, Single Fetus
- BY4BZZZ Ultrasonography of First Trimester, Multiple Gestation
- BY4CZZZ Ultrasonography of Second Trimester, Single Fetus
- BY4DZZZ Ultrasonography of Second Trimester, Multiple Gestation
- BY4FZZZ Ultrasonography of Third Trimester, Single Fetus
- BY4GZZZ Ultrasonography of Third Trimester, Multiple Gestation
About the BY4 Code Range
These procedures use high-frequency sound waves to show anatomy or flow in real time for the fetus, fetal umbilical cord, or placenta.
The fourth character identifies the fetal umbilical cord or placenta, or distinguishes fetal imaging by trimester and single fetus versus multiple gestation. The fifth character records None for contrast, and the sixth and seventh record None for their qualifiers.
Questions About This Page
How many billable codes are in the BY4 range?
Of the 9 codes in this range, 8 are billable and valid for inpatient claim submission from October 1, 2026 through September 30, 2027. Table header codes group them but cannot be reported on claims.
What does the BY4 range classify?
The range classifies Ultrasonography procedures, real time display of images of anatomy or flow information developed from the capture of reflected and attenuated high frequency sound waves, performed on the fetus and obstetrical. Each code adds the body part, approach, device, and qualifier in characters four through seven, and links to its own reference page.
Related References
Source: CMS FY 2027 ICD-10-PCS order file and code tables, effective October 1, 2026 through September 30, 2027.
