ICD-10-PCS Tabular Index · Section B · FY 2027 BY3

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 2027.

✓ Built from the official CMS FY 2027 datasetEffective Oct 1, 2026 – Sep 30, 2027
22
Procedure Codes
21
Billable Codes
BY3
Characters 1–3
BY
Parent Body System

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.

ICD-10-PCS

Codes in the BY3 Range 22 codes · 21 billable

22 of 22 shown
  • 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

These procedures use magnetic fields and radiofrequency signals to make images of the fetus or specific fetal parts.

The fourth character identifies the fetal head, heart, chest, abdomen, spine, extremities, or whole fetus. The fifth records Other Contrast or None. The sixth distinguishes Unenhanced and Enhanced from None. The seventh is always None.

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, 2026 through September 30, 2027. 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

All ICD-10-PCS SectionsAll of Imaging (B)All of Body System BYICD-10-PCS Code LookupICD-10-CM Codes ListMS-DRG ReferenceMedicare Code Edits

Source: CMS FY 2027 ICD-10-PCS order file and code tables, effective October 1, 2026 through September 30, 2027.