Skip to content
Dx

ICD-10-PCS 2027 procedure code

0NJ04ZZInspection of Skull, Percutaneous Endoscopic 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 0NJ04ZZ

0NJ04ZZ is the ICD-10-PCS code for a inspection procedure on the skull using a percutaneous endoscopic approach. In ICD-10-PCS, inspection means visually and/or manually exploring a body part.

In plain terms, this corresponds to other diagnostic procedures on skull, the ICD-9-CM procedure title it maps to (01.19).

For a different body part, codes include 0NJB4ZZ (nasal bone) and 0NJW4ZZ (facial bone).

The same procedure with a different approach is coded 0NJ00ZZ (open), 0NJ03ZZ (percutaneous) and 0NJ0XZZ (external).

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 477 (Biopsies of Musculoskeletal System and Connective Tissue with MCC or Insertion of Antibiotic-eluting Bone Void Filler), under the surgical categories “Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis”, “Craniotomy and endovascular intracranial procedures”, “Biopsies of Musculoskeletal System and Connective Tissue” and 2 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
JInspection

Visually and/or manually exploring a body part

Visual exploration may be performed with or without optical instrumentation. Manual exploration may be performed directly or through intervening body layers

Includes: Diagnostic arthroscopy, exploratory laparotomy

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
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.

ICD-9-CM equivalent

Converter →
  • 01.19Other diagnostic procedures on skullapproximate

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 0NJ04ZZ

Is 0NJ04ZZ a valid ICD-10-PCS code for 2027?

Yes. 0NJ04ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0NJ04ZZ an O.R. procedure?

Yes. 0NJ04ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0NJ04ZZ group to?

Depending on the principal diagnosis, 0NJ04ZZ can group to MS-DRG 023, MS-DRG 024, MS-DRG 025, MS-DRG 026, MS-DRG 027 and MS-DRG 477.

What is the ICD-9 procedure code for 0NJ04ZZ?

The CMS GEMs map 0NJ04ZZ to ICD-9-CM 01.19 (Other diagnostic procedures on skull).