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ICD-10-PCS 2027 procedure code

0C940ZZDrainage of 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 0C940ZZ

0C940ZZ is the ICD-10-PCS code for a drainage procedure on the buccal mucosa 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 drainage of face and floor of mouth, the ICD-9-CM procedure title it maps to (27.0).

For a different body part, codes include 0C900ZZ (upper lip), 0C910ZZ (lower lip), 0C920ZZ (hard palate), 0C930ZZ (soft palate), 0C950ZZ (upper gingiva), 0C960ZZ (lower gingiva) and 18 more.

The same procedure with a different approach is coded 0C943ZZ (percutaneous) and 0C94XZZ (external).

With a different device, use 0C9400Z (drainage device).

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
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
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

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

ICD-9-CM equivalent

Converter →
  • 27.0Drainage of face and floor 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 0C940ZZ

Is 0C940ZZ a valid ICD-10-PCS code for 2027?

Yes. 0C940ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0C940ZZ an O.R. procedure?

Yes. 0C940ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0C940ZZ group to?

Depending on the principal diagnosis, 0C940ZZ 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 0C940ZZ?

The CMS GEMs map 0C940ZZ to ICD-9-CM 27.0 (Drainage of face and floor of mouth).