Ear, Nose, Mouth and Throat (B9) ICD-10-PCS
The B9 body system covers Imaging procedures on ear, nose, mouth and throat, with 108 ICD-10-PCS codes across 4 root operations, 104 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 · 108 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 | 31 | 30 |
| 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 | 5 | 4 |
| B92 | Computerized Tomography (CT Scan)Computer-reformatted digital display of multiplanar images developed from the capture of multiple exposures of external ionizing radiation | 50 | 49 |
| 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 | 22 | 21 |
The info icon shows the official root operation definition and previews the codes in that range.
About the B9 Body System
These imaging codes show the ear, sinuses, salivary glands and throat sites, including the larynx, or voice box.
The tables separate plain radiography, which makes a flat image using radiation, from fluoroscopy, which displays images in real time. CT builds images from multiple radiation exposures, while MRI uses a magnetic field and radio signals. For the named glands, the body-part character distinguishes right, left and both sides.
Questions About This Page
How many codes are in the B9 body system?
The B9 body system contains 108 ICD-10-PCS codes in FY 2027, organized into 4 root operations. 104 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.
