Skip to content
Dx

ICD-10-PCS 2027 procedure code

4A0184ZMeasurement of Peripheral Nervous Electrical Activity, Via Natural or Artificial Opening Endoscopic

✓ Valid for 2027

Short description: Measurement of Peripheral Nervous Electrical Activity, Endo

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 4A0184Z

4A0184Z is the ICD-10-PCS code for a measurement procedure on the peripheral nervous using a via natural or artificial opening endoscopic approach with electrical activity. In ICD-10-PCS, measurement means determining the level of a physiological or physical function at a point in time.

In plain terms, this corresponds to electroencephalogram, the ICD-9-CM procedure title it maps to (89.14).

For a different body part, codes include 4A0084Z (central nervous), 4A0284Z (cardiac), 4A0H84Z (products of conception, cardiac) and 4A0J84Z (products of conception, nervous).

The same procedure with a different approach is coded 4A0104Z (open), 4A0134Z (percutaneous), 4A0174Z (via natural or artificial opening) and 4A01X4Z (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
0Measurement

Determining the level of a physiological or physical function at a point in time

4. Body System
1Peripheral Nervous
5. Approach
8Via Natural or Artificial Opening Endoscopic

Entry of instrumentation through a natural or artificial external opening to reach and visualize the site of the procedure

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

Other versions of this procedure

ICD-9-CM equivalent

Converter →
  • 89.14Electroencephalogramapproximate

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 4A0184Z

Is 4A0184Z a valid ICD-10-PCS code for 2027?

Yes. 4A0184Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A0184Z?

The CMS GEMs map 4A0184Z to ICD-9-CM 89.14 (Electroencephalogram).