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ICD-10-PCS 2027 procedure code

0W9C0ZZDrainage of Mediastinum, 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 0W9C0ZZ

0W9C0ZZ is the ICD-10-PCS code for a drainage procedure on the mediastinum using an open approach. In ICD-10-PCS, drainage means taking or letting out fluids and/or gases from a body part.

In plain terms, this corresponds to incision of mediastinum, the ICD-9-CM procedure title it maps to (34.1).

For a different body part, codes include 0W900ZZ (head), 0W910ZZ (cranial cavity), 0W920ZZ (face), 0W930ZZ (oral cavity and throat), 0W940ZZ (upper jaw), 0W950ZZ (lower jaw) and 13 more.

The same procedure with a different approach is coded 0W9C3ZZ (percutaneous) and 0W9C4ZZ (percutaneous endoscopic).

With a different device, use 0W9C00Z (drainage device).

It is an operating-room procedure in the MS-DRG logic for DRG 166 (Other Respiratory System O.R. Procedures with MCC), DRG 167 (Other Respiratory System O.R. Procedures with CC), DRG 168 (Other Respiratory System O.R. Procedures without CC/MCC), DRG 361 (Other Circulatory System O.R. Procedures with MCC), DRG 362 (Other Circulatory System O.R. Procedures without MCC) and DRG 907 (Other O.R. Procedures for Injuries with MCC), under the surgical categories “Other Respiratory System O.R. Procedures”, “Other Circulatory System O.R. Procedures”, “Other O.R. Procedures for Injuries” and 1 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
9Drainage

Taking or letting out fluids and/or gases from a body part

The qualifier DIAGNOSTIC is used to identify drainage procedures that are biopsies

Includes: Thoracentesis, incision and drainage

4. Body Part
CMediastinum

Includes: Mediastinal cavity; Mediastinal space

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

Different device

Different qualifier

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 →
  • 34.1Incision of mediastinumapproximate

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 0W9C0ZZ

Is 0W9C0ZZ a valid ICD-10-PCS code for 2027?

Yes. 0W9C0ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0W9C0ZZ an O.R. procedure?

Yes. 0W9C0ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0W9C0ZZ group to?

Depending on the principal diagnosis, 0W9C0ZZ can group to MS-DRG 166, MS-DRG 167, MS-DRG 168, MS-DRG 361, MS-DRG 362 and MS-DRG 907.

What is the ICD-9 procedure code for 0W9C0ZZ?

The CMS GEMs map 0W9C0ZZ to ICD-9-CM 34.1 (Incision of mediastinum).