ICD-10-PCS 2027 procedure code
09BC4ZZExcision of Left Mastoid Sinus, Percutaneous Endoscopic Approach
Short description: Excision 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 09BC4ZZ
09BC4ZZ is the ICD-10-PCS code for a excision procedure on the left mastoid sinus using a percutaneous endoscopic approach. In ICD-10-PCS, excision means cutting out or off, without replacement, a portion of a body part.
In plain terms, this corresponds to other mastoidectomy, the ICD-9-CM procedure title it maps to (20.49).
For a different body part, codes include 09B04ZZ (right external ear), 09B14ZZ (left external ear), 09B34ZZ (right external auditory canal), 09B44ZZ (left external auditory canal), 09B74ZZ (right tympanic membrane), 09B84ZZ (left tympanic membrane) and 16 more.
The same procedure with a different approach is coded 09BC0ZZ (open), 09BC3ZZ (percutaneous) and 09BC8ZZ (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
- BExcision
Cutting out or off, without replacement, a portion of a body part
The qualifier DIAGNOSTIC is used to identify excision procedures that are biopsies
Includes: Partial nephrectomy, liver biopsy
- 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
- 09B04ZZExternal Ear, Right
- 09B14ZZExternal Ear, Left
- 09B34ZZExternal Auditory Canal, Right
- 09B44ZZExternal Auditory Canal, Left
- 09B74ZZTympanic Membrane, Right
- 09B84ZZTympanic Membrane, Left
- 09BB4ZZMastoid Sinus, Right
- 09BF4ZZEustachian Tube, Right
- 09BG4ZZEustachian Tube, Left
- 09BK4ZZNasal Mucosa and Soft Tissue
- 09BL4ZZNasal Turbinate
- 09BM4ZZNasal Septum
Different qualifier
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 →- 20.49Other 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 09BC4ZZ
Is 09BC4ZZ a valid ICD-10-PCS code for 2027?
- Yes. 09BC4ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
Is 09BC4ZZ an O.R. procedure?
- Yes. 09BC4ZZ is an O.R. procedure in MS-DRG v44.0.
What DRG does 09BC4ZZ group to?
- Depending on the principal diagnosis, 09BC4ZZ can group to MS-DRG 135 and MS-DRG 136.
What is the ICD-9 procedure code for 09BC4ZZ?
- The CMS GEMs map 09BC4ZZ to ICD-9-CM 20.49 (Other mastoidectomy).