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ICD-10-PCS 2027 procedure code

4A1174ZMonitoring of Peripheral Nervous Electrical Activity, Via Natural or Artificial Opening

✓ Valid for 2027

Short description: Monitoring of PNS Electr Activity, Via Opening

Code last changed in FY2018 (effective October 1, 2017). Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data

About 4A1174Z

4A1174Z is the ICD-10-PCS code for a monitoring procedure on the peripheral nervous using a via natural or artificial opening 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 4A1074Z (central nervous), 4A1274Z (cardiac), 4A1H74Z (products of conception, cardiac) and 4A1J74Z (products of conception, nervous).

The same procedure with a different approach is coded 4A1104Z (open), 4A1134Z (percutaneous), 4A1184Z (via natural or artificial opening endoscopic) and 4A11X4Z (external).

It doesn't appear in the MS-DRG procedure index, so on its own it doesn't change the DRG assignment.

It was added in FY2018, effective October 1, 2017.

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
7Via Natural or Artificial Opening

Entry of instrumentation through a natural or artificial external opening 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
  • FY2018 (effective 10/1/2017): Added
  • No changes since FY2018.

Common questions about 4A1174Z

Is 4A1174Z a valid ICD-10-PCS code for 2027?

Yes. 4A1174Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A1174Z?

The CMS GEMs map 4A1174Z to ICD-9-CM 89.14 (Electroencephalogram) and 89.19 (Video and radio-telemetered electroencephalographic monitoring).