ICD-10-PCS 2027 procedure code
09TC4ZZResection of Left Mastoid Sinus, Percutaneous Endoscopic Approach
Short description: Resection of Left Mastoid Sinus, Perc Endo 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 09TC4ZZ
09TC4ZZ is the ICD-10-PCS code for a resection procedure on the left mastoid sinus using a percutaneous endoscopic approach. In ICD-10-PCS, resection means cutting out or off, without replacement, all of a body part.
In plain terms, this corresponds to radical mastoidectomy, the ICD-9-CM procedure title it maps to (20.42).
For a different body part, codes include 09T04ZZ (right external ear), 09T14ZZ (left external ear), 09T74ZZ (right tympanic membrane), 09T84ZZ (left tympanic membrane), 09TB4ZZ (right mastoid sinus), 09TF4ZZ (right eustachian tube) and 14 more.
The same procedure with a different approach is coded 09TC0ZZ (open) and 09TC8ZZ (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
- TResection
Cutting out or off, without replacement, all of a body part
Includes: Total nephrectomy, total lobectomy of lung
- 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
- 09T04ZZExternal Ear, Right
- 09T14ZZExternal Ear, Left
- 09T74ZZTympanic Membrane, Right
- 09T84ZZTympanic Membrane, Left
- 09TB4ZZMastoid Sinus, Right
- 09TF4ZZEustachian Tube, Right
- 09TG4ZZEustachian Tube, Left
- 09TK4ZZNasal Mucosa and Soft Tissue
- 09TL4ZZNasal Turbinate
- 09TM4ZZNasal Septum
- 09TN4ZZNasopharynx
- 09TP4ZZAccessory Sinus
Different approach
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 →- 20.42Radical 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 09TC4ZZ
Is 09TC4ZZ a valid ICD-10-PCS code for 2027?
- Yes. 09TC4ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
Is 09TC4ZZ an O.R. procedure?
- Yes. 09TC4ZZ is an O.R. procedure in MS-DRG v44.0.
What DRG does 09TC4ZZ group to?
- Depending on the principal diagnosis, 09TC4ZZ can group to MS-DRG 135 and MS-DRG 136.
What is the ICD-9 procedure code for 09TC4ZZ?
- The CMS GEMs map 09TC4ZZ to ICD-9-CM 20.42 (Radical mastoidectomy).