BY3 Magnetic Resonance Imaging (MRI) - Fetus and Obstetrical ICD-10-PCS
The BY3 code range contains 22 ICD-10-PCS codes for Magnetic Resonance Imaging (MRI) procedures on the fetus and obstetrical. 21 of the codes are billable and valid for inpatient claim submission in fiscal year 2026.
Root Operation Definition
Magnetic Resonance Imaging (MRI): Computer reformatted digital display of multiplanar images developed from the capture of radio frequency signals emitted by nuclei in a body site excited within a magnetic field.
Codes in the BY3 Range 22 codes · 21 billable
- BY3 Imaging, Fetus and Obstetrical, Magnetic Resonance Imaging (MRI)Non-billable header
- BY30Y0Z Magnetic Resonance Imaging (MRI) of Fetal Head using Other Contrast, Unenhanced and Enhanced
- BY30YZZ Magnetic Resonance Imaging (MRI) of Fetal Head using Other Contrast
- BY30ZZZ Magnetic Resonance Imaging (MRI) of Fetal Head
- BY31Y0Z Magnetic Resonance Imaging (MRI) of Fetal Heart using Other Contrast, Unenhanced and Enhanced
- BY31YZZ Magnetic Resonance Imaging (MRI) of Fetal Heart using Other Contrast
- BY31ZZZ Magnetic Resonance Imaging (MRI) of Fetal Heart
- BY32Y0Z Magnetic Resonance Imaging (MRI) of Fetal Thorax using Other Contrast, Unenhanced and Enhanced
- BY32YZZ Magnetic Resonance Imaging (MRI) of Fetal Thorax using Other Contrast
- BY32ZZZ Magnetic Resonance Imaging (MRI) of Fetal Thorax
- BY33Y0Z Magnetic Resonance Imaging (MRI) of Fetal Abdomen using Other Contrast, Unenhanced and Enhanced
- BY33YZZ Magnetic Resonance Imaging (MRI) of Fetal Abdomen using Other Contrast
- BY33ZZZ Magnetic Resonance Imaging (MRI) of Fetal Abdomen
- BY34Y0Z Magnetic Resonance Imaging (MRI) of Fetal Spine using Other Contrast, Unenhanced and Enhanced
- BY34YZZ Magnetic Resonance Imaging (MRI) of Fetal Spine using Other Contrast
- BY34ZZZ Magnetic Resonance Imaging (MRI) of Fetal Spine
- BY35Y0Z Magnetic Resonance Imaging (MRI) of Fetal Extremities using Other Contrast, Unenhanced and Enhanced
- BY35YZZ Magnetic Resonance Imaging (MRI) of Fetal Extremities using Other Contrast
- BY35ZZZ Magnetic Resonance Imaging (MRI) of Fetal Extremities
- BY36Y0Z Magnetic Resonance Imaging (MRI) of Whole Fetus using Other Contrast, Unenhanced and Enhanced
- BY36YZZ Magnetic Resonance Imaging (MRI) of Whole Fetus using Other Contrast
- BY36ZZZ Magnetic Resonance Imaging (MRI) of Whole Fetus
About the BY3 Code Range
The ICD-10-PCS root operation Magnetic Resonance Imaging (MRI) (BY3) refers to capturing detailed images of the fetus or obstetrical structures using magnetic resonance technology. This imaging technique provides high-resolution, non-invasive visualization without ionizing radiation.
Within the Imaging section, these codes specify MRI procedures targeting various fetal body parts and the whole fetus. Examples include MRI of the Fetal Head (codes BY30ZZZ, BY30YZZ, BY30Y0Z), Fetal Heart (codes BY31ZZZ, BY31YZZ, BY31Y0Z), Fetal Thorax (codes BY32ZZZ, BY32YZZ, BY32Y0Z), and other regions such as the Fetal Abdomen, Spine, Extremities, and the Whole Fetus. Contrast use is differentiated by codes indicating unenhanced, enhanced, or other contrast types, allowing precise documentation of imaging technique variations. Proper coding of these fetal MRI procedures supports accurate obstetrical diagnostic records and facilitates optimized patient care.
Questions About This Page
How many billable codes are in the BY3 range?
Of the 22 codes in this range, 21 are billable and valid for inpatient claim submission from October 1, 2025 through September 30, 2026. Table header codes group them but cannot be reported on claims.
What does the BY3 range classify?
The range classifies Magnetic Resonance Imaging (MRI) procedures, computer reformatted digital display of multiplanar images developed from the capture of radio frequency signals emitted by nuclei in a body site excited within a magnetic field, 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 2026 ICD-10-PCS order file and code tables, effective October 1, 2025 through September 30, 2026.
