Skip to content
Dx

ICD-10-PCS 2027 procedure code

4A1034ZMonitoring of Central Nervous Electrical Activity, Percutaneous Approach

✓ Valid for 2027

Short description: Monitoring of Central Nervous Electr Activity, Perc 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 4A1034Z

4A1034Z is the ICD-10-PCS code for a monitoring procedure on the central nervous using a percutaneous approach with electrical activity. 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 electroencephalogram and Video and radio-telemetered electroencephalographic monitoring, the ICD-9-CM procedure titles it maps to (89.14 and 89.19).

For a different body part, codes include 4A1134Z (peripheral nervous) and 4A1234Z (cardiac).

The same procedure with a different approach is coded 4A1004Z (open), 4A1074Z (via natural or artificial opening), 4A1084Z (via natural or artificial opening endoscopic) and 4A10X4Z (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
0Central Nervous
5. Approach
3Percutaneous

Entry, by puncture or minor incision, of instrumentation through the skin or mucous membrane and any other body layers necessary to reach the site of the procedure

6. Function / Device
4Electrical Activity
7. Qualifier
ZNo Qualifier

Other versions of this procedure

Different qualifier

ICD-9-CM equivalent

Converter →
  • 89.14Electroencephalogramapproximate
  • 89.19Video and radio-telemetered electroencephalographic monitoringapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about 4A1034Z

Is 4A1034Z a valid ICD-10-PCS code for 2027?

Yes. 4A1034Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A1034Z?

The CMS GEMs map 4A1034Z to ICD-9-CM 89.14 (Electroencephalogram) and 89.19 (Video and radio-telemetered electroencephalographic monitoring).