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ICD-10-PCS 2027 procedure code

4A00X2ZMeasurement of Central Nervous Conductivity, External Approach

✓ Valid for 2027

Short description: Measurement of Central Nervous Conductivity, Extern 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 4A00X2Z

4A00X2Z is the ICD-10-PCS code for a measurement procedure on the central nervous using an external approach with conductivity. 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 other nonoperative neurologic function tests, the ICD-9-CM procedure title it maps to (89.15).

For a different body part, codes include 4A0JX2Z (products of conception, nervous).

The same procedure with a different approach is coded 4A0002Z (open).

With a different device, use 4A00X4Z (electrical activity).

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
0Measurement

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

4. Body System
0Central Nervous
5. Approach
XExternal

Procedures performed directly on the skin or mucous membrane and procedures performed indirectly by the application of external force through the skin or mucous membrane

6. Function / Device
2Conductivity
7. Qualifier
ZNo Qualifier

Other versions of this procedure

Different approach

Different function / device

ICD-9-CM equivalent

Converter →
  • 89.15Other nonoperative neurologic function testsapproximate

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 4A00X2Z

Is 4A00X2Z a valid ICD-10-PCS code for 2027?

Yes. 4A00X2Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A00X2Z?

The CMS GEMs map 4A00X2Z to ICD-9-CM 89.15 (Other nonoperative neurologic function tests).