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ICD-10-PCS 2027 procedure code

0CN4XZZRelease Buccal Mucosa, External 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 0CN4XZZ

0CN4XZZ is the ICD-10-PCS code for a release procedure on the buccal mucosa using an external approach. 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 extension or deepening of buccolabial or lingual sulcus and other plastic repair of mouth, the ICD-9-CM procedure titles it maps to (24.91 and 27.59).

For a different body part, codes include 0CN0XZZ (upper lip), 0CN1XZZ (lower lip), 0CN2XZZ (hard palate), 0CN3XZZ (soft palate), 0CN5XZZ (upper gingiva), 0CN6XZZ (lower gingiva) and 4 more.

The same procedure with a different approach is coded 0CN40ZZ (open) and 0CN43ZZ (percutaneous).

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
4Buccal Mucosa

Includes: Buccal gland; Molar gland; Palatine gland

5. Approach
XExternal

Procedures performed directly on the skin or mucous membrane and procedures performed indirectly by the application of external force through the skin or mucous membrane

6. Device
ZNo Device
7. Qualifier
ZNo Qualifier

Other versions of this procedure

ICD-9-CM equivalent

Converter →
  • 24.91Extension or deepening of buccolabial or lingual sulcusapproximate
  • 27.59Other plastic repair of mouthapproximate

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 0CN4XZZ

Is 0CN4XZZ a valid ICD-10-PCS code for 2027?

Yes. 0CN4XZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 0CN4XZZ?

The CMS GEMs map 0CN4XZZ to ICD-9-CM 24.91 (Extension or deepening of buccolabial or lingual sulcus) and 27.59 (Other plastic repair of mouth).