01WY42ZRevision of Monitoring Device in Peripheral Nerve, Percutaneous Endoscopic Approach
- Billable / Specific Code
01WY42Z is a billable ICD-10-PCS procedure code for Revision of Monitoring Device in Peripheral Nerve, Percutaneous Endoscopic Approach. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRGs 040, 041, 042. The root operation Revision involves correcting, to the extent possible, a portion of a malfunctioning device or the position of a displaced device. In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under Peripheral nerve 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 | 1 | Peripheral Nervous System |
| 3 | Operation | W | Revision |
| 4 | BodyPart | Y | Peripheral Nerve |
| 5 | Approach | 4 | Percutaneous Endoscopic |
| 6 | Device | 2 | Monitoring 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:
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 01WY42Z
Is 01WY42Z a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Revision of Monitoring Device in Peripheral Nerve, Percutaneous Endoscopic Approach on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in 01WY42Z mean?
The code breaks down character by character: the 1st character 0 is the Section (Medical and Surgical); the 2nd character 1 is the Body System (Peripheral Nervous System); the 3rd character W is the Operation (Revision); the 4th character Y is the BodyPart (Peripheral Nerve); the 5th character 4 is the Approach (Percutaneous Endoscopic); the 6th character 2 is the Device (Monitoring Device); the 7th character Z is the Qualifier (No Qualifier).
What MS-DRG does 01WY42Z group to?
On an inpatient stay, Revision of Monitoring Device in Peripheral Nerve, Percutaneous Endoscopic Approach maps to MS-DRGs 040, 041, 042, with relative weights from 1.6757 to 3.7168. The MS-DRG sets the fixed Medicare payment for the stay.
What is the ICD-9-PCS equivalent of 01WY42Z?
Under the General Equivalence Mappings, Revision of Monitoring Device in Peripheral Nerve, Percutaneous Endoscopic Approach crosswalks to ICD-9-PCS 04.04 (Other incision of cranial and peripheral nerves) and 05.89 (Other operations on sympathetic nerves or ganglia). The mapping is approximate, so confirm it fits the documentation.
