D91999ZHigh Dose Rate (HDR) Brachytherapy of Soft Palate using Iodine 125 (I-125)
- Billable / Specific Code
D91999Z is a billable ICD-10-PCS procedure code for High Dose Rate (HDR) Brachytherapy of Soft Palate using Iodine 125 (I-125). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). 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 | 9 | Soft Palate |
| 5 | ModalityQualifier | 9 | High Dose Rate (HDR) |
| 6 | Isotope | 9 | Iodine 125 (I-125) |
| 7 | Qualifier | Z | None |
In the ICD-10-PCS Alphabetic Index
These FY 2026 ICD-10-PCS Alphabetic Index entries lead to D91999Z:
Clinical Classification (CCSR)
AHRQ groups D91999Z into these clinical categories.
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for D91999Z under the General Equivalence Mappings.
Similar Procedure Codes
Questions About D91999Z
Is D91999Z a billable code?
Yes. D91999Z is a complete seven-character ICD-10-PCS code, specific enough to report High Dose Rate (HDR) Brachytherapy of Soft Palate using Iodine 125 (I-125) on inpatient claims from October 1, 2025 through September 30, 2026.
What do the characters in D91999Z mean?
D91999Z 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 9 is the TreatmentSite (Soft Palate); 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 D91999Z?
Under the General Equivalence Mappings, High Dose Rate (HDR) Brachytherapy of Soft Palate using Iodine 125 (I-125) crosswalks to ICD-9-PCS 92.23. The mapping is approximate, so confirm it fits the documentation.
