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ICD-10-PCS 2027 procedure code

09BC4ZXExcision of Left Mastoid Sinus, Percutaneous Endoscopic Approach, Diagnostic

✓ Valid for 2027O.R. procedure

Short description: Excision of Left Mastoid Sinus, Perc Endo Approach, Diagn

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 09BC4ZX

09BC4ZX is the ICD-10-PCS code for a excision procedure on the left mastoid sinus using a percutaneous endoscopic 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 09B04ZX (right external ear), 09B14ZX (left external ear), 09B34ZX (right external auditory canal), 09B44ZX (left external auditory canal), 09B74ZX (right tympanic membrane), 09B84ZX (left tympanic membrane) and 16 more.

The same procedure with a different approach is coded 09BC0ZX (open), 09BC3ZX (percutaneous) 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
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
XDiagnostic

Other versions of this procedure

Different qualifier

MS-DRG v44.0 grouping

All DRGs →

Surgical MS-DRGs this procedure can group to, depending on the principal diagnosis's MDC.

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

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about 09BC4ZX

Is 09BC4ZX a valid ICD-10-PCS code for 2027?

Yes. 09BC4ZX is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 09BC4ZX an O.R. procedure?

Yes. 09BC4ZX is an O.R. procedure in MS-DRG v44.0.

What DRG does 09BC4ZX group to?

Depending on the principal diagnosis, 09BC4ZX can group to MS-DRG 143, MS-DRG 144 and MS-DRG 145.

What is the ICD-9 procedure code for 09BC4ZX?

The CMS GEMs map 09BC4ZX to ICD-9-CM 20.32 (Biopsy of middle and inner ear).