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ICD-10-PCS 2027 procedure code

0CN40ZZRelease Buccal Mucosa, 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 0CN40ZZ

0CN40ZZ is the ICD-10-PCS code for a release procedure on the buccal mucosa using an open 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 0CN00ZZ (upper lip), 0CN10ZZ (lower lip), 0CN20ZZ (hard palate), 0CN30ZZ (soft palate), 0CN50ZZ (upper gingiva), 0CN60ZZ (lower gingiva) and 18 more.

The same procedure with a different approach is coded 0CN43ZZ (percutaneous) and 0CN4XZZ (external).

It is an operating-room procedure in the MS-DRG logic for DRG 137 (Mouth Procedures with CC/MCC), DRG 138 (Mouth Procedures without CC/MCC), DRG 579 (Other Skin, Subcutaneous Tissue and Breast Procedures with MCC), DRG 580 (Other Skin, Subcutaneous Tissue and Breast Procedures with CC), DRG 581 (Other Skin, Subcutaneous Tissue and Breast Procedures without CC/MCC) and DRG 907 (Other O.R. Procedures for Injuries with MCC), under the surgical categories “Mouth Procedures”, “Other Skin, Subcutaneous Tissue and Breast 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
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
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

MS-DRG v44.0 grouping

All DRGs →

Surgical MS-DRGs this procedure can group to, depending on the principal diagnosis's MDC.

MDC 03 · Diseases and Disorders of the Ear, Nose, Mouth and Throat · Mouth Procedures

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 0CN40ZZ

Is 0CN40ZZ a valid ICD-10-PCS code for 2027?

Yes. 0CN40ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0CN40ZZ an O.R. procedure?

Yes. 0CN40ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0CN40ZZ group to?

Depending on the principal diagnosis, 0CN40ZZ can group to MS-DRG 137, MS-DRG 138, MS-DRG 579, MS-DRG 580, MS-DRG 581 and MS-DRG 907.

What is the ICD-9 procedure code for 0CN40ZZ?

The CMS GEMs map 0CN40ZZ to ICD-9-CM 24.91 (Extension or deepening of buccolabial or lingual sulcus) and 27.59 (Other plastic repair of mouth).