Ear, Nose, Mouth and Throat (C9) ICD-10-PCS
The C9 body system covers Nuclear Medicine procedures on ear, nose, mouth and throat, with 8 ICD-10-PCS codes across 1 root operations, 6 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 1 operations · 8 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| C91 | Planar Nuclear Medicine ImagingIntroduction of radioactive materials into the body for single plane display of images developed from the capture of radioactive emissions | 8 | 6 |
The info icon shows the official root operation definition and previews the codes in that range.
About the C9 Body System
The ICD-10-PCS root operation C9 refers to procedures involving Nuclear Medicine targeted at the Ear, Nose, Mouth, and Throat body system. This operation encompasses the use of radioactive materials to assist in diagnostic imaging of these anatomical areas.
C9 - Nuclear Medicine procedures involve introducing radioactive substances into the body to capture emitted radiation and create images that reveal underlying structures or conditions. A specific example within this classification is Planar Nuclear Medicine Imaging (code C91), which produces single-plane images by detecting radioactive emissions. This technique is valuable for detailed visualization and assessment of the ear, nose, mouth, and throat, facilitating accurate diagnosis and treatment planning.
Questions About This Page
How many codes are in the C9 body system?
The C9 body system contains 8 ICD-10-PCS codes in FY 2026, organized into 1 root operations. 6 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.
