0NT40ZZResection of Left Parietal Bone, Open Approach
- Billable / Specific Code
0NT40ZZ is a billable ICD-10-PCS procedure code for Resection of Left Parietal Bone, Open Approach. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to 21 MS-DRGs. The root operation Resection involves cutting out or off, without replacement, all of a body part. In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under Bone excision.
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 | N | Head and Facial Bones |
| 3 | Operation | T | Resection |
| 4 | BodyPart | 4 | Parietal Bone, Left |
| 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 resection of the left parietal bone, open the FY 2027 ICD-10-PCS Alphabetic Index at Resection, then the subterms Bone, Parietal, Left. The entry lists 0NT40ZZ 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.
Questions About 0NT40ZZ
Is 0NT40ZZ a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Resection of Left Parietal Bone, Open Approach on inpatient claims from October 1, 2026 through September 30, 2027.
What is the ICD-10-PCS code for resection of the left parietal bone?
The FY 2027 ICD-10-PCS Alphabetic Index entry Resection, Bone, Parietal, Left is a direct entry for 0NT40ZZ, Resection of Left Parietal Bone, Open Approach, billable on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in 0NT40ZZ mean?
The code breaks down character by character: the 1st character 0 is the Section (Medical and Surgical); the 2nd character N is the Body System (Head and Facial Bones); the 3rd character T is the Operation (Resection); the 4th character 4 is the BodyPart (Parietal Bone, Left); 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 0NT40ZZ group to?
On an inpatient stay, Resection of Left Parietal Bone, Open Approach maps to MS-DRGs 023, 024, 025, 026, 027, 143, 144, 145, 515, 516, 517, 820, 821, 822, 826, 827, 828, 907, 908, 909, 955, with relative weights from 1.1267 to 6.5257. The MS-DRG sets the fixed Medicare payment for the stay.
What is the ICD-9-PCS equivalent of 0NT40ZZ?
Under the General Equivalence Mappings, Resection of Left Parietal Bone, Open Approach crosswalks to ICD-9-PCS 01.25 (Other craniectomy). The mapping is approximate, so confirm it fits the documentation.
