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ICD-10-PCS 2027 procedure code

0CB4XZZExcision of Buccal Mucosa, External 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 0CB4XZZ

0CB4XZZ is the ICD-10-PCS code for a excision procedure on the buccal mucosa using an external approach. In ICD-10-PCS, excision means cutting out or off, without replacement, a portion of a body part.

In plain terms, this corresponds to other excision of mouth, the ICD-9-CM procedure title it maps to (27.49).

For a different body part, codes include 0CB0XZZ (upper lip), 0CB1XZZ (lower lip), 0CB2XZZ (hard palate), 0CB3XZZ (soft palate), 0CB5XZZ (upper gingiva), 0CB6XZZ (lower gingiva) and 4 more.

The same procedure with a different approach is coded 0CB40ZZ (open) and 0CB43ZZ (percutaneous).

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 907 (Other O.R. Procedures for Injuries with MCC), DRG 908 (Other O.R. Procedures for Injuries with CC), DRG 909 (Other O.R. Procedures for Injuries without CC/MCC) and DRG 957 (Other O.R. Procedures for Multiple Significant Trauma with MCC), under the surgical categories “Mouth Procedures”, “Other O.R. Procedures for Injuries” and “Other O.R. Procedures for Multiple Significant Trauma”.

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
BExcision

Cutting out or off, without replacement, a portion of a body part

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

Includes: Partial nephrectomy, liver biopsy

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

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 →
  • 27.49Other excision 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 0CB4XZZ

Is 0CB4XZZ a valid ICD-10-PCS code for 2027?

Yes. 0CB4XZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0CB4XZZ an O.R. procedure?

Yes. 0CB4XZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0CB4XZZ group to?

Depending on the principal diagnosis, 0CB4XZZ can group to MS-DRG 137, MS-DRG 138, MS-DRG 907, MS-DRG 908, MS-DRG 909 and MS-DRG 957.

What is the ICD-9 procedure code for 0CB4XZZ?

The CMS GEMs map 0CB4XZZ to ICD-9-CM 27.49 (Other excision of mouth).