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ICD-10-PCS 2027 procedure code

0NW04SZRevision of Hearing Device in Skull, Percutaneous Endoscopic Approach

✓ Valid for 2027O.R. procedure

Short description: Revision of Hearing Device in Skull, 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 0NW04SZ

0NW04SZ is the ICD-10-PCS code for a revision procedure on the skull using a percutaneous endoscopic approach with hearing device. In ICD-10-PCS, revision means correcting, to the extent possible, a portion of a malfunctioning device or the position of a displaced device.

In plain terms, this corresponds to other craniotomy, the ICD-9-CM procedure title it maps to (01.24).

The same procedure with a different approach is coded 0NW00SZ (open), 0NW03SZ (percutaneous) and 0NW0XSZ (external).

With a different device, use 0NW040Z (drainage device), 0NW043Z (infusion device), 0NW044Z (internal fixation device), 0NW045Z (external fixation device), 0NW047Z (autologous tissue substitute), 0NW04JZ (synthetic substitute) and 2 more.

It is an operating-room procedure in the MS-DRG logic for DRG 023 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator), DRG 024 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC), DRG 025 (Craniotomy and Endovascular Intracranial Procedures with MCC), DRG 026 (Craniotomy and Endovascular Intracranial Procedures with CC) and DRG 027 (Craniotomy and Endovascular Intracranial Procedures without CC/MCC), under the surgical categories “Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis” and “Craniotomy and endovascular intracranial 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
WRevision

Correcting, to the extent possible, a portion of a malfunctioning device or the position of a displaced device

Revision can include correcting a malfunctioning or displaced device by taking out or putting in components of the device such as a screw or pin

Includes: Adjustment of position of pacemaker lead, recementing of hip prosthesis

4. Body Part
0Skull
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
SHearing Device
7. Qualifier
ZNo Qualifier

Other versions of this procedure

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 →
  • 01.24Other craniotomyapproximate

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 0NW04SZ

Is 0NW04SZ a valid ICD-10-PCS code for 2027?

Yes. 0NW04SZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0NW04SZ an O.R. procedure?

Yes. 0NW04SZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0NW04SZ group to?

Depending on the principal diagnosis, 0NW04SZ can group to MS-DRG 023, MS-DRG 024, MS-DRG 025, MS-DRG 026 and MS-DRG 027.

What is the ICD-9 procedure code for 0NW04SZ?

The CMS GEMs map 0NW04SZ to ICD-9-CM 01.24 (Other craniotomy).