0CN40ZZRelease Buccal Mucosa, Open Approach
- Billable / Specific Code
0CN40ZZ is a billable ICD-10-PCS procedure code for Release Buccal Mucosa, Open Approach. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to 11 MS-DRGs. The root operation Release involves freeing a body part from an abnormal physical constraint by cutting or by the use of force. In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under ENT procedures, NEC.
Code Identity
PCS Table Breakdown
Each ICD-10-PCS code is built from seven characters, each an axis of the procedure. Hover or tap the icons for the official CMS definitions.
| Position | Designation | Value | Meaning |
|---|---|---|---|
| 1 | Section | 0 | Medical and Surgical |
| 2 | Body System | C | Mouth and Throat |
| 3 | Operation | N | Release |
| 4 | BodyPart | 4 | Buccal Mucosa |
| 5 | Approach | 0 | Open |
| 6 | Device | Z | No Device |
| 7 | Qualifier | Z | No Qualifier |
In the ICD-10-PCS Alphabetic Index
These FY 2027 ICD-10-PCS Alphabetic Index entries lead to this code:
To code release of the buccal mucosa, open the FY 2027 ICD-10-PCS Alphabetic Index at Release, then the subterm Buccal Mucosa. The index leads to table 0CN, where the approach, device and qualifier values shown in the breakdown above complete the seven-character code 0CN40ZZ.
Clinical Classification (CCSR)
AHRQ groups this procedure code into these clinical categories.
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for this code under the General Equivalence Mappings.
Similar Procedure Codes
Questions About 0CN40ZZ
Is 0CN40ZZ a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Release Buccal Mucosa, Open Approach on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in 0CN40ZZ mean?
The code breaks down character by character: the 1st character 0 is the Section (Medical and Surgical); the 2nd character C is the Body System (Mouth and Throat); the 3rd character N is the Operation (Release); the 4th character 4 is the BodyPart (Buccal Mucosa); the 5th character 0 is the Approach (Open); the 6th character Z is the Device (No Device); the 7th character Z is the Qualifier (No Qualifier).
What MS-DRG does 0CN40ZZ group to?
On an inpatient stay, Release Buccal Mucosa, Open Approach maps to MS-DRGs 137, 138, 579, 580, 581, 907, 908, 909, 957, 958, 959, with relative weights from 0.9184 to 7.5502. The MS-DRG sets the fixed Medicare payment for the stay.
What is the ICD-9-PCS equivalent of 0CN40ZZ?
Under the General Equivalence Mappings, Release Buccal Mucosa, Open Approach crosswalks to ICD-9-PCS 24.91 (Extension or deepening of buccolabial or lingual sulcus) and 27.59 (Other plastic repair of mouth). The mapping is approximate, so confirm it fits the documentation.
