ICD-10-PCS 2027 procedure code
09QC4ZZRepair Left Mastoid Sinus, Percutaneous Endoscopic Approach
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 09QC4ZZ
09QC4ZZ is the ICD-10-PCS code for a repair procedure on the left mastoid sinus using a percutaneous endoscopic approach. In ICD-10-PCS, repair means restoring, to the extent possible, a body part to its normal anatomic structure and function.
In plain terms, this corresponds to revision of mastoidectomy, the ICD-9-CM procedure title it maps to (20.92).
For a different body part, codes include 09Q04ZZ (right external ear), 09Q14ZZ (left external ear), 09Q24ZZ (bilateral external ear), 09Q34ZZ (right external auditory canal), 09Q44ZZ (left external auditory canal), 09Q74ZZ (right tympanic membrane) and 17 more.
The same procedure with a different approach is coded 09QC0ZZ (open), 09QC3ZZ (percutaneous) and 09QC8ZZ (via natural or artificial opening endoscopic).
It is an operating-room procedure in the MS-DRG logic for DRG 135 (Sinus and Mastoid Procedures with CC/MCC) and DRG 136 (Sinus and Mastoid Procedures without CC/MCC), under the surgical category “Sinus and Mastoid Procedures”.
It has been valid since ICD-10-PCS took effect on October 1, 2015.
What each character means
- 1. Section
- 0Medical and Surgical
- 2. Body System
- 9Ear, Nose, Sinus
- 3. Operation
- QRepair
Restoring, to the extent possible, a body part to its normal anatomic structure and function
Used only when the method to accomplish the repair is not one of the other root operations
Includes: Colostomy takedown, suture of laceration
- 4. Body Part
- CMastoid Sinus, Left
Includes: Mastoid air cells
- 5. Approach
- 4Percutaneous Endoscopic
Entry, by puncture or minor incision, of instrumentation through the skin or mucous membrane and any other body layers necessary to reach and visualize the site of the procedure
- 6. Device
- ZNo Device
- 7. Qualifier
- ZNo Qualifier
Other versions of this procedure
Different body part
- 09Q04ZZExternal Ear, Right
- 09Q14ZZExternal Ear, Left
- 09Q24ZZExternal Ear, Bilateral
- 09Q34ZZExternal Auditory Canal, Right
- 09Q44ZZExternal Auditory Canal, Left
- 09Q74ZZTympanic Membrane, Right
- 09Q84ZZTympanic Membrane, Left
- 09QB4ZZMastoid Sinus, Right
- 09QF4ZZEustachian Tube, Right
- 09QG4ZZEustachian Tube, Left
- 09QK4ZZNasal Mucosa and Soft Tissue
- 09QL4ZZNasal Turbinate
MS-DRG v44.0 grouping
All DRGs →Surgical MS-DRGs this procedure can group to, depending on the principal diagnosis's MDC.
MDC 03 · Diseases and Disorders of the Ear, Nose, Mouth and Throat · Sinus and Mastoid Procedures
ICD-9-CM equivalent
Converter →- 20.92Revision of mastoidectomyapproximate
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 09QC4ZZ
Is 09QC4ZZ a valid ICD-10-PCS code for 2027?
- Yes. 09QC4ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
Is 09QC4ZZ an O.R. procedure?
- Yes. 09QC4ZZ is an O.R. procedure in MS-DRG v44.0.
What DRG does 09QC4ZZ group to?
- Depending on the principal diagnosis, 09QC4ZZ can group to MS-DRG 135 and MS-DRG 136.
What is the ICD-9 procedure code for 09QC4ZZ?
- The CMS GEMs map 09QC4ZZ to ICD-9-CM 20.92 (Revision of mastoidectomy).