ICD-10-PCS Code For First Trimester, Multiple Gestation: Procedure Code Group Overview

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group BY4B includes procedures performed to image fetal and obstetrical structures in the first trimester of a multiple gestation pregnancy. These ICD-10-PCS codes are used for inpatient documentation when ultrasonography is performed to evaluate viability, dating, number of embryos, or early pregnancy complications in multiple gestation. Accurate coding within the ICD-10-PCS BY4B group is essential for proper inpatient reimbursement, as it captures the imaging procedure performed and supports clinical documentation accuracy.

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First Trimester, Multiple Gestation Ultrasonography Procedure Overview

Procedures in this group involve real-time display and capture of reflected high-frequency sound waves to produce images of the fetus and related obstetrical structures during the first trimester in a multiple gestation pregnancy. These procedures target the fetus and obstetrical body system and include imaging to assess viability, dating, number of embryos, and early anatomic evaluation. Accurate ICD-10-PCS coding of these ultrasonography procedures is important for inpatient reimbursement because it documents the specific imaging performed and supports appropriate case mix and payment.

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
B	Section	Imaging
Y	Body System	Fetus and Obstetrical
4	Operation	Ultrasonography
B	Body Part	First Trimester, Multiple Gestation

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ICD-10-PCS Code For First Trimester, Multiple Gestation: Procedure Code Group Overview

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First Trimester, Multiple Gestation Ultrasonography Procedure Overview

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
B	Section	Imaging
Y	Body System	Fetus and Obstetrical
4	Operation	Ultrasonography
B	Body Part	First Trimester, Multiple Gestation

When to Use

Use a code from this group when inpatient ultrasonography is performed in the first trimester for a multiple gestation pregnancy to evaluate viability, dating, or early complications. Select the code that accurately reflects the procedure performed, the imaging modality, and the first trimester multiple gestation anatomical focus.

ICD-10-PCS Codes

1 rows

ICD-10-PCS Code	Description
BY4BZZZ	Ultrasonography of First Trimester, Multiple Gestation

Typical Clinical Scenarios

A pregnant patient in her first trimester presents to the inpatient labor and delivery unit with vaginal bleeding after a transvaginal assessment in clinic suggested possible multiple gestation; she is hemodynamically stable but requires immediate confirmation of viability, number of embryos, and location to guide inpatient observation and management. An inpatient real-time ultrasonography is performed focusing on first-trimester evaluation of multiple embryos to document fetal heart activity and rule out complications such as threatened miscarriage or heterotopic pregnancy. Typical codes: BY4BZZZ
A routine scheduled inpatient admission for early pregnancy assessment in a patient with assisted reproductive technology (ART) who conceived twins; she requires detailed first-trimester dating, documentation of chorionicity and amnionicity, and baseline anatomic survey to plan prenatal care and resource allocation. A non-emergent ultrasonography procedure is performed to image multiple gestation embryos and provide official inpatient documentation of number and early anatomy. Typical codes: BY4BZZZ
A patient with known multiple gestation in the first trimester is admitted for pelvic pain and possible ectopic complications after sudden worsening of symptoms; clinicians perform urgent inpatient ultrasonography to evaluate each embryo, identify location of all gestational sacs, and assess for signs of impending pregnancy loss that may alter immediate inpatient management. Real-time imaging of first-trimester multiple gestation anatomy is used to inform urgent clinical decisions and monitoring. Typical codes: BY4BZZZ

ICD-10-PCS Code For Fetal Umbilical Cord: Procedure Code Group Overview

BY48-PLACENTA-ULTRASONOGRAPHY

ICD-10-PCS Code For Placenta: Procedure Code Group Overview

BY49-FIRST-TRIMESTER-SINGLE-FETUS-ULTRASONOGRAPHY

ICD-10-PCS Code For First Trimester Single Fetus: Procedure Code Group Overview

BY4C-SECOND-TRIMESTER-ULTRASONOGRAPHY

ICD-10-PCS Code For Second Trimester, Single Fetus: Procedure Code Group Overview

BY4D-SECOND-TRIMESTER-MULTIPLE-GESTATION-ULTRASONOGRAPHY

ICD-10-PCS Code For Second Trimester, Multiple Gestation: Procedure Code Group Overview

BY4F-THIRD-TRIMESTER-SINGLE-FETUS-ULTRASONOGRAPHY

ICD-10-PCS Code For Third Trimester Single Fetus: Procedure Code Group Overview

BY4G-THIRD-TRIMESTER-MULTIPLE-GESTATION-ULTRASONOGRAPHY

ICD-10-PCS Code For Third Trimester, Multiple Gestation: Procedure Code Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-PCS Codes

1 rows

ICD-10-PCS Code	Description
BY4BZZZ	Ultrasonography of First Trimester, Multiple Gestation

Typical Clinical Scenarios

A pregnant patient in her first trimester presents to the inpatient labor and delivery unit with vaginal bleeding after a transvaginal assessment in clinic suggested possible multiple gestation; she is hemodynamically stable but requires immediate confirmation of viability, number of embryos, and location to guide inpatient observation and management. An inpatient real-time ultrasonography is performed focusing on first-trimester evaluation of multiple embryos to document fetal heart activity and rule out complications such as threatened miscarriage or heterotopic pregnancy. Typical codes: BY4BZZZ
A routine scheduled inpatient admission for early pregnancy assessment in a patient with assisted reproductive technology (ART) who conceived twins; she requires detailed first-trimester dating, documentation of chorionicity and amnionicity, and baseline anatomic survey to plan prenatal care and resource allocation. A non-emergent ultrasonography procedure is performed to image multiple gestation embryos and provide official inpatient documentation of number and early anatomy. Typical codes: BY4BZZZ
A patient with known multiple gestation in the first trimester is admitted for pelvic pain and possible ectopic complications after sudden worsening of symptoms; clinicians perform urgent inpatient ultrasonography to evaluate each embryo, identify location of all gestational sacs, and assess for signs of impending pregnancy loss that may alter immediate inpatient management. Real-time imaging of first-trimester multiple gestation anatomy is used to inform urgent clinical decisions and monitoring. Typical codes: BY4BZZZ

ICD-10-PCS Code For Fetal Umbilical Cord: Procedure Code Group Overview

BY48-PLACENTA-ULTRASONOGRAPHY

ICD-10-PCS Code For Placenta: Procedure Code Group Overview

BY49-FIRST-TRIMESTER-SINGLE-FETUS-ULTRASONOGRAPHY

ICD-10-PCS Code For First Trimester Single Fetus: Procedure Code Group Overview

BY4C-SECOND-TRIMESTER-ULTRASONOGRAPHY

ICD-10-PCS Code For Second Trimester, Single Fetus: Procedure Code Group Overview

BY4D-SECOND-TRIMESTER-MULTIPLE-GESTATION-ULTRASONOGRAPHY

ICD-10-PCS Code For Second Trimester, Multiple Gestation: Procedure Code Group Overview

BY4F-THIRD-TRIMESTER-SINGLE-FETUS-ULTRASONOGRAPHY

ICD-10-PCS Code For Third Trimester Single Fetus: Procedure Code Group Overview

BY4G-THIRD-TRIMESTER-MULTIPLE-GESTATION-ULTRASONOGRAPHY

ICD-10-PCS Code For Third Trimester, Multiple Gestation: Procedure Code Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

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ICD-10-PCS Code For First Trimester, Multiple Gestation: Procedure Code Group Overview

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First Trimester, Multiple Gestation Ultrasonography Procedure Overview

Code Attributes

OpenPayer

ICD-10-PCS Code For First Trimester, Multiple Gestation: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For First Trimester, Multiple Gestation: Procedure Code Group Overview policy alerts

First Trimester, Multiple Gestation Ultrasonography Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

References

ICD-10-PCS Code For First Trimester, Multiple Gestation: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For First Trimester, Multiple Gestation: Procedure Code Group Overview policy alerts

First Trimester, Multiple Gestation Ultrasonography Procedure Overview

Code Attributes

ICD-10-PCS Code For First Trimester, Multiple Gestation: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For First Trimester, Multiple Gestation: Procedure Code Group Overview policy alerts

First Trimester, Multiple Gestation Ultrasonography Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

What procedures are included in the BY4B code group?

For what clinical purposes is `BY4BZZZ` used?

Which ICD-10-PCS section and body system apply to this procedure group?

Why is accurate coding within the BY4B group important for inpatient records?

What code(s) specifically identify ultrasonography of first trimester, multiple gestation?

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

What procedures are included in the BY4B code group?

For what clinical purposes is `BY4BZZZ` used?

Which ICD-10-PCS section and body system apply to this procedure group?

Why is accurate coding within the BY4B group important for inpatient records?

What code(s) specifically identify ultrasonography of first trimester, multiple gestation?

References