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ICD-10-PCS 2027 procedure code

0WJC4ZZInspection of Mediastinum, 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 0WJC4ZZ

0WJC4ZZ is the ICD-10-PCS code for a inspection procedure on the mediastinum 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 Mediastinoscopy, the ICD-9-CM procedure title it maps to (34.22).

For a different body part, codes include 0WJ04ZZ (head), 0WJ14ZZ (cranial cavity), 0WJ24ZZ (face), 0WJ34ZZ (oral cavity and throat), 0WJ44ZZ (upper jaw), 0WJ54ZZ (lower jaw) and 16 more.

The same procedure with a different approach is coded 0WJC0ZZ (open) and 0WJC3ZZ (percutaneous).

It is an operating-room procedure in the MS-DRG logic for DRG 143 (Other Ear, Nose, Mouth and Throat O.R. Procedures with MCC), DRG 144 (Other Ear, Nose, Mouth and Throat O.R. Procedures with CC), DRG 145 (Other Ear, Nose, Mouth and Throat O.R. Procedures without CC/MCC), DRG 166 (Other Respiratory System O.R. Procedures with MCC), DRG 167 (Other Respiratory System O.R. Procedures with CC) and DRG 168 (Other Respiratory System O.R. Procedures without CC/MCC), under the surgical categories “Other Ear, Nose, Mouth and Throat O.R. Procedures”, “Other Respiratory System O.R. Procedures”, “Other Circulatory System 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
WAnatomical Regions, General
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
CMediastinum

Includes: Mediastinal cavity; Mediastinal space

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.

MDC 05 · Diseases and Disorders of the Circulatory System · Other Circulatory System O.R. Procedures

ICD-9-CM equivalent

Converter →
  • 34.22Mediastinoscopyexact

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 0WJC4ZZ

Is 0WJC4ZZ a valid ICD-10-PCS code for 2027?

Yes. 0WJC4ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0WJC4ZZ an O.R. procedure?

Yes. 0WJC4ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0WJC4ZZ group to?

Depending on the principal diagnosis, 0WJC4ZZ can group to MS-DRG 143, MS-DRG 144, MS-DRG 145, MS-DRG 166, MS-DRG 167 and MS-DRG 168.

What is the ICD-9 procedure code for 0WJC4ZZ?

The CMS GEMs map 0WJC4ZZ to ICD-9-CM 34.22 (Mediastinoscopy).