ICD-10-PCS 2027 procedure code
09BC0ZXExcision of Left Mastoid Sinus, Open Approach, Diagnostic
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 09BC0ZX
09BC0ZX is the ICD-10-PCS code for a excision procedure on the left mastoid sinus using an open approach (qualifier: diagnostic). In ICD-10-PCS, excision means cutting out or off, without replacement, a portion of a body part.
In plain terms, this corresponds to biopsy of middle and inner ear, the ICD-9-CM procedure title it maps to (20.32).
For a different body part, codes include 09B00ZX (right external ear), 09B10ZX (left external ear), 09B30ZX (right external auditory canal), 09B40ZX (left external auditory canal), 09B50ZX (right middle ear), 09B60ZX (left middle ear) and 22 more.
The same procedure with a different approach is coded 09BC3ZX (percutaneous), 09BC4ZX (percutaneous endoscopic) and 09BC8ZX (via natural or artificial opening endoscopic).
It is an operating-room procedure in the MS-DRG logic for DRG 143 (Other Ear, Nose, Mouth and Throat O.R. Procedures with MCC), DRG 144 (Other Ear, Nose, Mouth and Throat O.R. Procedures with CC) and DRG 145 (Other Ear, Nose, Mouth and Throat O.R. Procedures without CC/MCC), under the surgical category “Other Ear, Nose, Mouth and Throat O.R. 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
- 0Open
Cutting through the skin or mucous membrane and any other body layers necessary to expose the site of the procedure
- 6. Device
- ZNo Device
- 7. Qualifier
- XDiagnostic
Other versions of this procedure
Different body part
- 09B00ZXExternal Ear, Right
- 09B10ZXExternal Ear, Left
- 09B30ZXExternal Auditory Canal, Right
- 09B40ZXExternal Auditory Canal, Left
- 09B50ZXMiddle Ear, Right
- 09B60ZXMiddle Ear, Left
- 09B70ZXTympanic Membrane, Right
- 09B80ZXTympanic Membrane, Left
- 09B90ZXAuditory Ossicle, Right
- 09BA0ZXAuditory Ossicle, Left
- 09BB0ZXMastoid Sinus, Right
- 09BD0ZXInner Ear, 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 · Other Ear, Nose, Mouth and Throat O.R. Procedures
ICD-9-CM equivalent
Converter →- 20.32Biopsy of middle and inner earapproximate
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 09BC0ZX
Is 09BC0ZX a valid ICD-10-PCS code for 2027?
- Yes. 09BC0ZX is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
Is 09BC0ZX an O.R. procedure?
- Yes. 09BC0ZX is an O.R. procedure in MS-DRG v44.0.
What DRG does 09BC0ZX group to?
- Depending on the principal diagnosis, 09BC0ZX can group to MS-DRG 143, MS-DRG 144 and MS-DRG 145.
What is the ICD-9 procedure code for 09BC0ZX?
- The CMS GEMs map 09BC0ZX to ICD-9-CM 20.32 (Biopsy of middle and inner ear).