ICD-10-PCS 2027 procedure code
09BC8ZZExcision of Left Mastoid Sinus, Via Natural or Artificial Opening Endoscopic
Short description: Excision of Left Mastoid Sinus, Endo
Code last changed in FY2018 (effective October 1, 2017). Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data
About 09BC8ZZ
09BC8ZZ is the ICD-10-PCS code for a excision procedure on the left mastoid sinus using a via natural or artificial opening 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 09B38ZZ (right external auditory canal), 09B48ZZ (left external auditory canal), 09B58ZZ (right middle ear), 09B68ZZ (left middle ear), 09B78ZZ (right tympanic membrane), 09B88ZZ (left tympanic membrane) and 20 more.
The same procedure with a different approach is coded 09BC0ZZ (open), 09BC3ZZ (percutaneous) and 09BC4ZZ (percutaneous 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 was added in FY2018, effective October 1, 2017.
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
- 8Via Natural or Artificial Opening Endoscopic
Entry of instrumentation through a natural or artificial external opening 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
- 09B38ZZExternal Auditory Canal, Right
- 09B48ZZExternal Auditory Canal, Left
- 09B58ZZMiddle Ear, Right
- 09B68ZZMiddle Ear, Left
- 09B78ZZTympanic Membrane, Right
- 09B88ZZTympanic Membrane, Left
- 09B98ZZAuditory Ossicle, Right
- 09BA8ZZAuditory Ossicle, Left
- 09BB8ZZMastoid Sinus, Right
- 09BD8ZZInner Ear, Right
- 09BE8ZZInner Ear, Left
- 09BF8ZZEustachian Tube, Right
Different approach
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
- FY2018 (effective 10/1/2017): Added
- No changes since FY2018.
Common questions about 09BC8ZZ
Is 09BC8ZZ a valid ICD-10-PCS code for 2027?
- Yes. 09BC8ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
Is 09BC8ZZ an O.R. procedure?
- Yes. 09BC8ZZ is an O.R. procedure in MS-DRG v44.0.
What DRG does 09BC8ZZ group to?
- Depending on the principal diagnosis, 09BC8ZZ can group to MS-DRG 135 and MS-DRG 136.
What is the ICD-9 procedure code for 09BC8ZZ?
- The CMS GEMs map 09BC8ZZ to ICD-9-CM 20.49 (Other mastoidectomy).