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ICD-10-PCS 2027 procedure code

0N9G4ZZDrainage of Left Ethmoid Bone, Percutaneous Endoscopic Approach

✓ Valid for 2027O.R. procedure

Short description: Drainage of Left Ethmoid Bone, 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 0N9G4ZZ

0N9G4ZZ is the ICD-10-PCS code for a drainage procedure on the left ethmoid bone using a percutaneous endoscopic approach. In ICD-10-PCS, drainage means taking or letting out fluids and/or gases from a body part.

In plain terms, this corresponds to other incision of facial bone, the ICD-9-CM procedure title it maps to (76.09).

For a different body part, codes include 0N904ZZ (skull), 0N914ZZ (frontal bone), 0N934ZZ (right parietal bone), 0N944ZZ (left parietal bone), 0N954ZZ (right temporal bone), 0N964ZZ (left temporal bone) and 16 more.

The same procedure with a different approach is coded 0N9G0ZZ (open) and 0N9G3ZZ (percutaneous).

With a different device, use 0N9G40Z (drainage device).

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
NHead and Facial Bones
3. Operation
9Drainage

Taking or letting out fluids and/or gases from a body part

The qualifier DIAGNOSTIC is used to identify drainage procedures that are biopsies

Includes: Thoracentesis, incision and drainage

4. Body Part
GEthmoid Bone, Left

Includes: Cribriform plate

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 device

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 →
  • 76.09Other incision of facial boneapproximate

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 0N9G4ZZ

Is 0N9G4ZZ a valid ICD-10-PCS code for 2027?

Yes. 0N9G4ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0N9G4ZZ an O.R. procedure?

Yes. 0N9G4ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0N9G4ZZ group to?

Depending on the principal diagnosis, 0N9G4ZZ can group to MS-DRG 143, MS-DRG 144 and MS-DRG 145.

What is the ICD-9 procedure code for 0N9G4ZZ?

The CMS GEMs map 0N9G4ZZ to ICD-9-CM 76.09 (Other incision of facial bone).