Central Nervous System (B0) ICD-10-PCS
The B0 body system covers Imaging procedures on central nervous system, with 124 ICD-10-PCS codes across 5 root operations, 114 of them billable in fiscal year 2026. Each root operation defines a distinct procedural objective, and the info icons show the official definition with a preview of the codes inside.
Root Operations in This Body System 5 operations · 124 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| B00 | Plain RadiographyPlanar display of an image developed from the capture of external ionizing radiation on photographic or photoconductive plate | 10 | 8 |
| B01 | FluoroscopySingle plane or bi-plane real time display of an image developed from the capture of external ionizing radiation on fluorescent screen. The image may also be stored by either digital or analog means | 10 | 8 |
| B02 | Computerized Tomography (CT Scan)Computer-reformatted digital display of multiplanar images developed from the capture of multiple exposures of external ionizing radiation | 72 | 70 |
| B03 | 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 | 26 | 24 |
| B04 | UltrasonographyReal time display of images of anatomy or flow information developed from the capture of reflected and attenuated high frequency sound waves | 6 | 4 |
The info icon shows the official root operation definition and previews the codes in that range.
About the B0 Body System
The ICD-10-PCS root operation B0 within the Imaging section focuses on diagnostic procedures involving detailed visualization of the Central Nervous System. This operation encompasses several imaging modalities used to capture internal body structures without invasive intervention.
Specifically, these imaging techniques include Plain Radiography (Code B00), which produces planar images using external ionizing radiation; Fluoroscopy (Code B01), offering real-time single or biplane images; and Computerized Tomography (CT Scan) (Code B02), which provides computer-reformatted multiplanar views from multiple X-ray exposures. Advanced methods such as Magnetic Resonance Imaging (MRI) (Code B03) use radio frequency signals within a magnetic field to create detailed digital images, while Ultrasonography (Code B04) employs high-frequency sound waves to visualize anatomy and blood flow in real time. These CNS imaging codes are essential for accurately documenting diagnostic evaluations of neurological conditions.
Questions About This Page
How many codes are in the B0 body system?
The B0 body system contains 124 ICD-10-PCS codes in FY 2026, organized into 5 root operations. 114 of them are billable on inpatient claims.
What is a root operation?
The root operation is the third character of every ICD-10-PCS code and names the objective of the procedure. Drainage takes fluid out, Excision cuts out a portion of a body part, and Resection removes all of one. Picking the right root operation is the central skill of PCS coding, so each one above carries its official CMS definition.
Related References
Source: CMS FY 2026 ICD-10-PCS order file and code tables, effective October 1, 2025 through September 30, 2026.
