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| 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 |