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ICD-10-PCS 2027 procedure code

0CNW0Z2Release Upper Tooth, All, Open Approach

✓ Valid for 2027

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 0CNW0Z2

0CNW0Z2 is the ICD-10-PCS code for a release procedure on the upper tooth using an open approach (qualifier: all). In ICD-10-PCS, release means freeing a body part from an abnormal physical constraint by cutting or by the use of force.

In plain terms, this corresponds to other dental operations, the ICD-9-CM procedure title it maps to (24.99).

For a different body part, codes include 0CNX0Z2 (lower tooth).

The same procedure with a different approach is coded 0CNWXZ2 (external).

It doesn't appear in the MS-DRG procedure index, so on its own it doesn't change the DRG assignment.

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
CMouth and Throat
3. Operation
NRelease

Freeing a body part from an abnormal physical constraint by cutting or by the use of force

Some of the restraining tissue may be taken out but none of the body part is taken out

Includes: Adhesiolysis, carpal tunnel release

4. Body Part
WUpper Tooth
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
2All

Other versions of this procedure

Different body part

Different approach

Different qualifier

ICD-9-CM equivalent

Converter →
  • 24.99Other dental operationsapproximate

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 0CNW0Z2

Is 0CNW0Z2 a valid ICD-10-PCS code for 2027?

Yes. 0CNW0Z2 is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 0CNW0Z2?

The CMS GEMs map 0CNW0Z2 to ICD-9-CM 24.99 (Other dental operations).