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ICD-10-PCS 2027 procedure code

0NS504ZReposition Right Temporal Bone with Internal Fixation Device, Open Approach

✓ Valid for 2027O.R. procedure

Short description: Reposition Right Temporal Bone with Int Fix, Open 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 0NS504Z

0NS504Z is the ICD-10-PCS code for a reposition procedure on the right temporal bone using an open approach with internal fixation device. In ICD-10-PCS, reposition means moving to its normal location, or other suitable location, all or a portion of a body part.

In plain terms, this corresponds to elevation of skull fracture fragments, the ICD-9-CM procedure title it maps to (02.02).

For a different body part, codes include 0NS004Z (skull), 0NS104Z (frontal bone), 0NS304Z (right parietal bone), 0NS404Z (left parietal bone), 0NS604Z (left temporal bone), 0NS704Z (occipital bone) and 16 more.

The same procedure with a different approach is coded 0NS534Z (percutaneous) and 0NS544Z (percutaneous endoscopic).

With a different device, use 0NS50ZZ (no device).

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), DRG 027 (Craniotomy and Endovascular Intracranial Procedures without CC/MCC) and DRG 143 (Other Ear, Nose, Mouth and Throat O.R. Procedures with MCC), under the surgical categories “Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis”, “Craniotomy and endovascular intracranial procedures”, “Other Ear, Nose, Mouth and Throat O.R. Procedures” and 3 more.

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
SReposition

Moving to its normal location, or other suitable location, all or a portion of a body part

The body part is moved to a new location from an abnormal location, or from a normal location where it is not functioning correctly. The body part may or may not be cut out or off to be moved to the new location

Includes: Reposition of undescended testicle, fracture reduction

4. Body Part
5Temporal Bone, Right
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
4Internal Fixation Device
7. Qualifier
ZNo Qualifier

Other versions of this procedure

Different device

MS-DRG v44.0 grouping

All DRGs →

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

MDC 24 · Multiple Significant Trauma · Craniotomy for Multiple Significant Trauma

ICD-9-CM equivalent

Converter →
  • 02.02Elevation of skull fracture fragmentsapproximate

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 0NS504Z

Is 0NS504Z a valid ICD-10-PCS code for 2027?

Yes. 0NS504Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0NS504Z an O.R. procedure?

Yes. 0NS504Z is an O.R. procedure in MS-DRG v44.0.

What DRG does 0NS504Z group to?

Depending on the principal diagnosis, 0NS504Z can group to MS-DRG 023, MS-DRG 024, MS-DRG 025, MS-DRG 026, MS-DRG 027 and MS-DRG 143.

What is the ICD-9 procedure code for 0NS504Z?

The CMS GEMs map 0NS504Z to ICD-9-CM 02.02 (Elevation of skull fracture fragments).