Ear, Nose, Mouth and Throat (D9) ICD-10-PCS
The D9 body system covers Radiation Therapy procedures on ear, nose, mouth and throat, with 340 ICD-10-PCS codes across 4 root operations, 336 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 · 340 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| D90 | Beam RadiationA type of radiation therapy that uses a machine to aim high-energy rays at the cancer from outside of the body | 97 | 96 |
| D91 | BrachytherapyA type of radiation therapy in which radioactive material sealed in needles, seeds, wires, or catheters is placed directly into or near a tumor | 169 | 168 |
| D92 | Stereotactic RadiosurgeryA type of external radiation therapy that uses special equipment to position the patient and precisely give a single large dose of radiation to a tumor | 34 | 33 |
| D9Y | Other Radiation | 40 | 39 |
The info icon shows the official root operation definition and previews the codes in that range.
About the D9 Body System
These radiation therapy codes cover treatment sites in the ear, nose, mouth, and throat, including the tongue, salivary glands, sinuses, and palate.
The tables separate beam radiation, brachytherapy, stereotactic radiosurgery, and other radiation by treatment type. The fourth character identifies the treatment site, with separate values for the hard and soft palate and for parts of the pharynx, or throat.
Questions About This Page
How many codes are in the D9 body system?
The D9 body system contains 340 ICD-10-PCS codes in FY 2027, organized into 4 root operations. 336 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.
