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 2027. 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
These codes describe images of the skull and facial bones, including the eye sockets, jaw, teeth, and jaw joints.
Plain radiography makes a flat image using radiation, while fluoroscopy displays radiation images in real time. CT builds images across multiple planes from radiation exposures; MRI uses signals from a body site in a magnetic field. The fourth character identifies the site, distinguishing a single tooth from multiple teeth or all teeth, and right, left, or both sides for some sites.
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 2027, 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 2027 ICD-10-PCS order file and code tables, effective October 1, 2026 through September 30, 2027.
