Skull and Facial Bones (BN) ICD-10-PCS
The BN body system covers Imaging procedures on skull and facial bones, with 67 ICD-10-PCS codes across 4 root operations, 63 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 4 operations · 67 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| BN0 | Plain RadiographyPlanar display of an image developed from the capture of external ionizing radiation on photographic or photoconductive plate | 26 | 25 |
| BN1 | 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 | 13 | 12 |
| BN2 | Computerized Tomography (CT Scan)Computer-reformatted digital display of multiplanar images developed from the capture of multiple exposures of external ionizing radiation | 25 | 24 |
| BN3 | 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 | 3 | 2 |
The info icon shows the official root operation definition and previews the codes in that range.
About the BN Body System
The ICD-10-PCS Imaging classification for the Skull and Facial Bones provides a range of diagnostic techniques to visualize these structures. This body system imaging is identified under the root operation code BN, which covers various modalities used to capture and display images for clinical evaluation.
The imaging methods include Plain Radiography (BN0), which produces planar images using external ionizing radiation on photographic plates, and Fluoroscopy (BN1), allowing real-time visualization with a fluorescent screen that may be recorded digitally or analogically. More advanced techniques include Computerized Tomography (CT Scan) (BN2), which generates multiplanar digital images from multiple ionizing radiation exposures, and Magnetic Resonance Imaging (MRI) (BN3), capturing multiplanar images via radio frequency signals from nuclei within a magnetic field. Utilizing these specific skull and facial bones imaging codes ensures precise documentation and aids in the accurate diagnosis and management of conditions affecting these critical anatomical areas.
Questions About This Page
How many codes are in the BN body system?
The BN body system contains 67 ICD-10-PCS codes in FY 2026, organized into 4 root operations. 63 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.
