0C94XZZDrainage of Buccal Mucosa, External Approach
- Billable / Specific Code
0C94XZZ is a billable ICD-10-PCS procedure code for Drainage of Buccal Mucosa, External 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 Drainage involves taking or letting out fluids and/or gases from a body part. In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under ENT drainage (excluding myringotomy).
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 | 9 | Drainage |
| 4 | BodyPart | 4 | Buccal Mucosa |
| 5 | Approach | X | External |
| 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 drainage of the buccal mucosa, open the FY 2027 ICD-10-PCS Alphabetic Index at Drainage, then the subterm Buccal Mucosa. The index leads to table 0C9, where the approach, device and qualifier values shown in the breakdown above complete the seven-character code 0C94XZZ.
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 0C94XZZ
Is 0C94XZZ a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Drainage of Buccal Mucosa, External Approach on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in 0C94XZZ 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 9 is the Operation (Drainage); the 4th character 4 is the BodyPart (Buccal Mucosa); the 5th character X is the Approach (External); the 6th character Z is the Device (No Device); the 7th character Z is the Qualifier (No Qualifier).
What MS-DRG does 0C94XZZ group to?
On an inpatient stay, Drainage of Buccal Mucosa, External 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 0C94XZZ?
Under the General Equivalence Mappings, Drainage of Buccal Mucosa, External Approach crosswalks to ICD-9-PCS 27.0 (Drainage of face and floor of mouth). The mapping is approximate, so confirm it fits the documentation.
