D91D99ZHigh Dose Rate (HDR) Brachytherapy of Nasopharynx using Iodine 125 (I-125)
- Billable / Specific Code
D91D99Z is a billable ICD-10-PCS procedure code for High Dose Rate (HDR) Brachytherapy of Nasopharynx using Iodine 125 (I-125). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026).
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 | 9 | Iodine 125 (I-125) |
| 7 | Qualifier | Z | None |
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for D91D99Z under the General Equivalence Mappings.
Similar Procedure Codes
Questions About D91D99Z
Is D91D99Z a billable code?
Yes. D91D99Z is a complete seven-character ICD-10-PCS code, specific enough to report High Dose Rate (HDR) Brachytherapy of Nasopharynx using Iodine 125 (I-125) on inpatient claims from October 1, 2025 through September 30, 2026.
What do the characters in D91D99Z mean?
D91D99Z 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 9 is the Isotope (Iodine 125 (I-125)); the 7th character Z is the Qualifier (None).
What is the ICD-9-PCS equivalent of D91D99Z?
Under the General Equivalence Mappings, High Dose Rate (HDR) Brachytherapy of Nasopharynx using Iodine 125 (I-125) crosswalks to ICD-9-PCS 92.23. The mapping is approximate, so confirm it fits the documentation.
