D91D9YZHigh Dose Rate (HDR) Brachytherapy of Nasopharynx using Other Isotope
- Billable / Specific Code
D91D9YZ is a billable ICD-10-PCS procedure code for High Dose Rate (HDR) Brachytherapy of Nasopharynx using Other Isotope. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027). In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under Brachytherapy.
Code Identity
PCS Table Breakdown
Each ICD-10-PCS code is built from seven characters, each an axis of the procedure. Hover or tap the icons for the official CMS definitions.
| Position | Designation | Value | Meaning |
|---|---|---|---|
| 1 | Section | D | Radiation Therapy |
| 2 | Body System | 9 | Ear, Nose, Mouth and Throat |
| 3 | Modality | 1 | Brachytherapy |
| 4 | TreatmentSite | D | Nasopharynx |
| 5 | ModalityQualifier | 9 | High Dose Rate (HDR) |
| 6 | Isotope | Y | Other Isotope |
| 7 | Qualifier | Z | None |
In the ICD-10-PCS Alphabetic Index
These FY 2027 ICD-10-PCS Alphabetic Index entries lead to this code:
To code brachytherapy of the nasopharynx, open the FY 2027 ICD-10-PCS Alphabetic Index at Brachytherapy, then the subterm Nasopharynx. The index leads to table D91, where the modality qualifier, isotope and qualifier values shown in the breakdown above complete the seven-character code D91D9YZ.
Clinical Classification (CCSR)
AHRQ groups this procedure code into these clinical categories.
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for this code under the General Equivalence Mappings.
Similar Procedure Codes
Questions About D91D9YZ
Is D91D9YZ a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report High Dose Rate (HDR) Brachytherapy of Nasopharynx using Other Isotope on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in D91D9YZ mean?
The code breaks down character by character: the 1st character D is the Section (Radiation Therapy); the 2nd character 9 is the Body System (Ear, Nose, Mouth and Throat); the 3rd character 1 is the Modality (Brachytherapy); the 4th character D is the TreatmentSite (Nasopharynx); the 5th character 9 is the ModalityQualifier (High Dose Rate (HDR)); the 6th character Y is the Isotope (Other Isotope); the 7th character Z is the Qualifier (None).
What is the ICD-9-PCS equivalent of D91D9YZ?
Under the General Equivalence Mappings, High Dose Rate (HDR) Brachytherapy of Nasopharynx using Other Isotope crosswalks to ICD-9-PCS 92.23 (Radioisotopic teleradiotherapy). The mapping is approximate, so confirm it fits the documentation.
