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ICD-10-PCS 2027 procedure code

0NH604ZInsertion of Internal Fixation Device into Left Temporal Bone, Open Approach

✓ Valid for 2027O.R. procedure

Short description: Insertion of Int Fix into L Temporal Bone, 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 0NH604Z

0NH604Z is the ICD-10-PCS code for a insertion procedure on the left temporal bone using an open approach with internal fixation device. In ICD-10-PCS, insertion means putting in a nonbiological appliance that monitors, assists, performs, or prevents a physiological function but does not physically take the place of a body part.

In plain terms, this corresponds to other cranial osteoplasty, the ICD-9-CM procedure title it maps to (02.06).

For a different body part, codes include 0NH004Z (skull), 0NH104Z (frontal bone), 0NH304Z (right parietal bone), 0NH404Z (left parietal bone), 0NH504Z (right temporal bone), 0NH704Z (occipital bone) and 16 more.

The same procedure with a different approach is coded 0NH634Z (percutaneous) and 0NH644Z (percutaneous endoscopic).

With a different device, use 0NH60SZ (hearing 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
HInsertion

Putting in a nonbiological appliance that monitors, assists, performs, or prevents a physiological function but does not physically take the place of a body part

Includes: Insertion of radioactive implant, insertion of central venous catheter

4. Body Part
6Temporal Bone, Left

Includes: Mastoid process; Petrous part of temporal bone; Tympanic part of temporal bone; Zygomatic process of temporal bone

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 →
  • 02.06Other cranial osteoplastyapproximate

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 0NH604Z

Is 0NH604Z a valid ICD-10-PCS code for 2027?

Yes. 0NH604Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0NH604Z an O.R. procedure?

Yes. 0NH604Z is an O.R. procedure in MS-DRG v44.0.

What DRG does 0NH604Z group to?

Depending on the principal diagnosis, 0NH604Z 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 0NH604Z?

The CMS GEMs map 0NH604Z to ICD-9-CM 02.06 (Other cranial osteoplasty).