0WM40ZZReattachment of Upper Jaw, Open Approach
- Billable / Specific Code
0WM40ZZ is a billable ICD-10-PCS procedure code for Reattachment of Upper Jaw, Open Approach. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to 9 MS-DRGs. The root operation Reattachment involves putting back in or on all or a portion of a separated body part to its normal location or other suitable location. 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 | W | Anatomical Regions, General |
| 3 | Operation | M | Reattachment |
| 4 | BodyPart | 4 | Upper Jaw |
| 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 reattachment of the upper jaw, open the FY 2027 ICD-10-PCS Alphabetic Index at Reattachment, then the subterms Jaw, Upper. The entry lists 0WM40ZZ directly as a complete, billable code.
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 0WM40ZZ
Is 0WM40ZZ a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Reattachment of Upper Jaw, Open Approach on inpatient claims from October 1, 2026 through September 30, 2027.
What is the ICD-10-PCS code for reattachment of the upper jaw?
The FY 2027 ICD-10-PCS Alphabetic Index entry Reattachment, Jaw, Upper is a direct entry for 0WM40ZZ, Reattachment of Upper Jaw, Open Approach, billable on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in 0WM40ZZ mean?
The code breaks down character by character: the 1st character 0 is the Section (Medical and Surgical); the 2nd character W is the Body System (Anatomical Regions, General); the 3rd character M is the Operation (Reattachment); the 4th character 4 is the BodyPart (Upper Jaw); 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 0WM40ZZ group to?
On an inpatient stay, Reattachment of Upper Jaw, Open Approach maps to MS-DRGs 143, 144, 145, 579, 580, 581, 907, 908, 909, with relative weights from 1.2335 to 3.8962. The MS-DRG sets the fixed Medicare payment for the stay.
What is the ICD-9-PCS equivalent of 0WM40ZZ?
Under the General Equivalence Mappings, Reattachment of Upper Jaw, Open Approach crosswalks to ICD-9-PCS 86.89 (Other repair and reconstruction of skin and subcutaneous tissue). The mapping is approximate, so confirm it fits the documentation.
