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

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group BY49 includes procedures performed to capture and display real-time ultrasonographic images and flow information of the first trimester, single fetus. These ICD-10-PCS codes are used for inpatient documentation when real-time ultrasonography is performed to evaluate early fetal viability, gestational age, or other first-trimester obstetrical concerns for a single fetus. Accurate coding within the ICD-10-PCS BY49 group is essential for proper inpatient reimbursement, as it captures the specific imaging procedure performed and supports clinical documentation accuracy for payment and case mix determination.

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First Trimester, Single Fetus Ultrasonography Procedure Overview

This procedure group includes real-time ultrasonography of the first trimester for a single fetus, targeting the fetus and obstetrical body system. Procedures capture reflected and attenuated high-frequency sound waves to generate images or flow information used for assessment of early fetal viability, dating, and basic anatomy. Accurate ICD-10-PCS coding of these imaging procedures is important for inpatient reimbursement because it documents the specific imaging service performed and supports appropriate case assignment and payment.

Code Attributes

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

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

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First Trimester, Single Fetus 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
9	Body Part	First Trimester, Single Fetus

When to Use

Use a code from this group when an inpatient ultrasonography examination of the first trimester is performed specifically for a single fetus to assess viability, dating, or preliminary anatomic evaluation. Do not use these codes for second or third trimester exams, multiple gestations, or nonobstetrical fetal imaging.

ICD-10-PCS Codes

1 rows

ICD-10-PCS Code	Description
BY49ZZZ	Ultrasonography of First Trimester, Single Fetus

Typical Clinical Scenarios

A pregnant patient at 8 weeks gestation presents to the inpatient obstetrical triage unit with acute vaginal bleeding and crampy pelvic pain after a syncopal episode; clinicians need to assess early fetal viability, location of the pregnancy (intrauterine vs ectopic), and presence of cardiac activity, so real-time first trimester ultrasonography is performed to evaluate these concerns. Typical codes: BY49ZZZ
A patient admitted electively for early pregnancy evaluation due to uncertain dates and assisted reproductive technology conception requests inpatient dating and confirmation of a single intrauterine gestation; a first-trimester real-time ultrasound is performed to establish gestational age, confirm single fetal number, and document early anatomy for inpatient records. Typical codes: BY49ZZZ
A patient with known single first-trimester pregnancy is admitted for management of suspected molar changes after markedly elevated beta-hCG and abnormal ultrasound at an outpatient visit; an inpatient real-time first trimester ultrasonography is used to re-evaluate the single fetus, assess molar features, and guide clinical management. Typical codes: BY49ZZZ

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

BY4B-FIRST-TRIMESTER-MULTIPLE-GESTATION-ULTRASONOGRAPHY

ICD-10-PCS Code For First Trimester, Multiple Gestation: 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
BY49ZZZ	Ultrasonography of First Trimester, Single Fetus

Typical Clinical Scenarios

A pregnant patient at 8 weeks gestation presents to the inpatient obstetrical triage unit with acute vaginal bleeding and crampy pelvic pain after a syncopal episode; clinicians need to assess early fetal viability, location of the pregnancy (intrauterine vs ectopic), and presence of cardiac activity, so real-time first trimester ultrasonography is performed to evaluate these concerns. Typical codes: BY49ZZZ
A patient admitted electively for early pregnancy evaluation due to uncertain dates and assisted reproductive technology conception requests inpatient dating and confirmation of a single intrauterine gestation; a first-trimester real-time ultrasound is performed to establish gestational age, confirm single fetal number, and document early anatomy for inpatient records. Typical codes: BY49ZZZ
A patient with known single first-trimester pregnancy is admitted for management of suspected molar changes after markedly elevated beta-hCG and abnormal ultrasound at an outpatient visit; an inpatient real-time first trimester ultrasonography is used to re-evaluate the single fetus, assess molar features, and guide clinical management. Typical codes: BY49ZZZ

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

BY4B-FIRST-TRIMESTER-MULTIPLE-GESTATION-ULTRASONOGRAPHY

ICD-10-PCS Code For First Trimester, Multiple Gestation: 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.

OpenPayer

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

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First Trimester, Single Fetus Ultrasonography Procedure Overview

Code Attributes

OpenPayer

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

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First Trimester, Single Fetus 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 Single Fetus: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For First Trimester Single Fetus: Procedure Code Group Overview policy alerts

First Trimester, Single Fetus Ultrasonography Procedure Overview

Code Attributes

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

Sign up for ICD-10-PCS Code For First Trimester Single Fetus: Procedure Code Group Overview policy alerts

First Trimester, Single Fetus Ultrasonography Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-PCS code identifies first trimester ultrasonography for a single fetus?

What clinical purposes does the `BY49ZZZ` procedure support?

Under which ICD-10-PCS section and body system is `BY49ZZZ` classified?

Why is accurate coding of `BY49ZZZ` important for inpatient documentation?

When should the `BY49ZZZ` code be used in patient records?

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-PCS code identifies first trimester ultrasonography for a single fetus?

What clinical purposes does the `BY49ZZZ` procedure support?

Under which ICD-10-PCS section and body system is `BY49ZZZ` classified?

Why is accurate coding of `BY49ZZZ` important for inpatient documentation?

When should the `BY49ZZZ` code be used in patient records?

References