Ear, Nose, Mouth and Throat (B9) ICD-10-PCS
The B9 body system covers Imaging procedures on ear, nose, mouth and throat, with 216 ICD-10-PCS codes across 4 root operations, 208 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 · 216 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| B90 | Plain RadiographyPlanar display of an image developed from the capture of external ionizing radiation on photographic or photoconductive plate | 62 | 60 |
| B91 | 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 |
| B92 | Computerized Tomography (CT Scan)Computer-reformatted digital display of multiplanar images developed from the capture of multiple exposures of external ionizing radiation | 100 | 98 |
| B93 | 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 | 44 | 42 |
The info icon shows the official root operation definition and previews the codes in that range.
About the B9 Body System
The ICD-10-PCS root operation B9 refers to Imaging within the Ear, Nose, Mouth and Throat body system. This operation involves capturing visual representations of these anatomical regions for diagnostic purposes without any direct physical intervention.
This imaging operation includes several distinct modalities. Plain Radiography (B90) produces planar images using external ionizing radiation captured on a photographic or photoconductive plate. Fluoroscopy (B91) provides real-time, single or bi-plane imaging with ionizing radiation displayed on a fluorescent screen, which may be stored digitally or analogically. More advanced techniques include Computerized Tomography (CT Scan) (B92), which generates computer-reformatted multiplanar images from multiple radiation exposures, and Magnetic Resonance Imaging (MRI) (B93), which creates digital images from radiofrequency signals emitted by nuclei excited within a magnetic field. These ear, nose, mouth and throat imaging codes enable precise documentation of diagnostic imaging procedures essential for clinical evaluation and treatment planning.
Questions About This Page
How many codes are in the B9 body system?
The B9 body system contains 216 ICD-10-PCS codes in FY 2026, organized into 4 root operations. 208 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.
