BY4CZZZUltrasonography of Second Trimester, Single Fetus
- Billable / Specific Code
BY4CZZZ is a billable ICD-10-PCS procedure code for Ultrasonography of Second Trimester, Single Fetus. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027). The root operation Ultrasonography involves real time display of images of anatomy or flow information developed from the capture of reflected and attenuated high frequency sound waves. In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under Ultrasonography.
Code Identity
PCS Table Breakdown
Each ICD-10-PCS code is built from seven characters, each an axis of the procedure. Hover or tap the icons for the official CMS definitions.
| Position | Designation | Value | Meaning |
|---|---|---|---|
| 1 | Section | B | Imaging |
| 2 | Body System | Y | Fetus and Obstetrical |
| 3 | Type | 4 | Ultrasonography |
| 4 | BodyPart | C | Second Trimester, Single Fetus |
| 5 | Contrast | Z | None |
| 6 | Qualifier | Z | None |
| 7 | Qualifier | Z | None |
In the ICD-10-PCS Alphabetic Index
These FY 2027 ICD-10-PCS Alphabetic Index entries lead to this code:
To code mapping of the doppler ultrasound, open the FY 2027 ICD-10-PCS Alphabetic Index at Mapping, then the subterm Doppler ultrasound. The index leads to table BY4, where the contrast, qualifier and qualifier values shown in the breakdown above complete the seven-character code BY4CZZZ.
Clinical Classification (CCSR)
AHRQ groups this procedure code into these clinical categories.
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for this code under the General Equivalence Mappings.
Similar Procedure Codes
Questions About BY4CZZZ
Is BY4CZZZ a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Ultrasonography of Second Trimester, Single Fetus on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in BY4CZZZ mean?
The code breaks down character by character: the 1st character B is the Section (Imaging); the 2nd character Y is the Body System (Fetus and Obstetrical); the 3rd character 4 is the Type (Ultrasonography); the 4th character C is the BodyPart (Second Trimester, Single Fetus); the 5th character Z is the Contrast (None); the 6th character Z is the Qualifier (None); the 7th character Z is the Qualifier (None).
What is the ICD-9-PCS equivalent of BY4CZZZ?
Under the General Equivalence Mappings, Ultrasonography of Second Trimester, Single Fetus crosswalks to ICD-9-PCS 88.78 (Diagnostic ultrasound of gravid uterus). The mapping is approximate, so confirm it fits the documentation.
