ICD-10-PCS 2027 procedure code
D9Y4CZZIntraoperative Radiation Therapy (IORT) of Mouth
Code unchanged since ICD-10-PCS took effect on October 1, 2015. Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data
About D9Y4CZZ
D9Y4CZZ is the ICD-10-PCS code for a other radiation procedure on the mouth using an intraoperative radiation therapy (IORT) approach with none (qualifier: none).
In plain terms, this corresponds to other radiotherapeutic procedure, the ICD-9-CM procedure title it maps to (92.29).
For a different body part, codes include D9YBCZZ (larynx), D9YCCZZ (pharynx) and D9YDCZZ (nasopharynx).
The same procedure with a different approach is coded D9Y47ZZ (contact radiation), D9Y48ZZ (hyperthermia) and D9Y4FZZ (plaque radiation).
It doesn't appear in the MS-DRG procedure index, so on its own it doesn't change the DRG assignment.
It has been valid since ICD-10-PCS took effect on October 1, 2015.
What each character means
- 1. Section
- DRadiation Therapy
- 2. Body System
- 9Ear, Nose, Mouth and Throat
- 3. Modality
- YOther Radiation
- 4. Treatment Site
- 4Mouth
- 5. Modality Qualifier
- CIntraoperative Radiation Therapy (IORT)
- 6. Isotope
- ZNone
- 7. Qualifier
- ZNone
Other versions of this procedure
Different treatment site
Different modality qualifier
ICD-9-CM equivalent
Converter →- 92.29Other radiotherapeutic procedureapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about D9Y4CZZ
Is D9Y4CZZ a valid ICD-10-PCS code for 2027?
- Yes. D9Y4CZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
What is the ICD-9 procedure code for D9Y4CZZ?
- The CMS GEMs map D9Y4CZZ to ICD-9-CM 92.29 (Other radiotherapeutic procedure).