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ICD-10-PCS 2027 procedure code

0NT40ZZResection of Left Parietal Bone, Open Approach

✓ Valid for 2027O.R. procedure

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 0NT40ZZ

0NT40ZZ is the ICD-10-PCS code for a resection procedure on the left parietal bone using an open approach. In ICD-10-PCS, resection means cutting out or off, without replacement, all of a body part.

In plain terms, this corresponds to other craniectomy, the ICD-9-CM procedure title it maps to (01.25).

For a different body part, codes include 0NT10ZZ (frontal bone), 0NT30ZZ (right parietal bone), 0NT50ZZ (right temporal bone), 0NT60ZZ (left temporal bone), 0NT70ZZ (occipital bone), 0NTB0ZZ (nasal bone) and 15 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), 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 5 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
TResection

Cutting out or off, without replacement, all of a body part

Includes: Total nephrectomy, total lobectomy of lung

4. Body Part
4Parietal Bone, Left
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
ZNo 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.

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

ICD-9-CM equivalent

Converter →
  • 01.25Other craniectomyapproximate

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 0NT40ZZ

Is 0NT40ZZ a valid ICD-10-PCS code for 2027?

Yes. 0NT40ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0NT40ZZ an O.R. procedure?

Yes. 0NT40ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0NT40ZZ group to?

Depending on the principal diagnosis, 0NT40ZZ 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 0NT40ZZ?

The CMS GEMs map 0NT40ZZ to ICD-9-CM 01.25 (Other craniectomy).