ICD-10-PCS 2027 procedure code
4A1104GMonitoring of Peripheral Nervous Electrical Activity, Intraoperative, Open Approach
Short description: Monitoring of PNS Electr Activity, Intraop, Open Approach
Code unchanged since ICD-10-PCS took effect on October 1, 2015. Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data
About 4A1104G
4A1104G is the ICD-10-PCS code for a monitoring procedure on the peripheral nervous using an open approach with electrical activity (qualifier: intraoperative). In ICD-10-PCS, monitoring means determining the level of a physiological or physical function repetitively over a period of time.
In plain terms, this corresponds to intra-operative neurophysiologic monitoring, the ICD-9-CM procedure title it maps to (00.94).
For a different body part, codes include 4A1004G (central nervous).
The same procedure with a different approach is coded 4A1134G (percutaneous), 4A1174G (via natural or artificial opening), 4A1184G (via natural or artificial opening endoscopic) and 4A11X4G (external).
It doesn't appear in the MS-DRG procedure index, so on its own it doesn't change the DRG assignment.
It has been valid since ICD-10-PCS took effect on October 1, 2015.
What each character means
- 1. Section
- 4Measurement and Monitoring
- 2. Body System
- APhysiological Systems
- 3. Operation
- 1Monitoring
Determining the level of a physiological or physical function repetitively over a period of time
- 4. Body System
- 1Peripheral Nervous
- 5. Approach
- 0Open
Cutting through the skin or mucous membrane and any other body layers necessary to expose the site of the procedure
- 6. Function / Device
- 4Electrical Activity
- 7. Qualifier
- GIntraoperative
Other versions of this procedure
Different body system
Different approach
Different qualifier
ICD-9-CM equivalent
Converter →- 00.94Intra-operative neurophysiologic monitoringapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about 4A1104G
Is 4A1104G a valid ICD-10-PCS code for 2027?
- Yes. 4A1104G is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
What is the ICD-9 procedure code for 4A1104G?
- The CMS GEMs map 4A1104G to ICD-9-CM 00.94 (Intra-operative neurophysiologic monitoring).