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ICD-10-PCS 2027 procedure code

4A01029Measurement of Peripheral Nervous Conductivity, Sensory, Open Approach

✓ Valid for 2027

Short description: Measurement of PNS Conductivity, Sensory, 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 4A01029

4A01029 is the ICD-10-PCS code for a measurement procedure on the peripheral nervous using an open approach with conductivity (qualifier: sensory). 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).

The same procedure with a different approach is coded 4A01329 (percutaneous), 4A01729 (via natural or artificial opening), 4A01829 (via natural or artificial opening endoscopic) and 4A01X29 (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
0Measurement

Determining the level of a physiological or physical function at a point in 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
2Conductivity
7. Qualifier
9Sensory

Other versions of this procedure

Different qualifier

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 4A01029

Is 4A01029 a valid ICD-10-PCS code for 2027?

Yes. 4A01029 is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A01029?

The CMS GEMs map 4A01029 to ICD-9-CM 89.15 (Other nonoperative neurologic function tests).