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ICD-10-PCS 2027 procedure code

4A02XFZMeasurement of Cardiac Rhythm, External Approach

✓ Valid for 2027

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 4A02XFZ

4A02XFZ is the ICD-10-PCS code for a measurement procedure on the cardiac using an external approach with rhythm. 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 Noninvasive programmed electrical stimulation [NIPS] and rhythm electrocardiogram, the ICD-9-CM procedure titles it maps to (37.20 and 89.51).

For a different body part, codes include 4A0HXFZ (products of conception, cardiac).

The same procedure with a different approach is coded 4A020FZ (open), 4A023FZ (percutaneous), 4A027FZ (via natural or artificial opening) and 4A028FZ (via natural or artificial opening endoscopic).

With a different device, use 4A02X4Z (electrical activity), 4A02X9Z (output), 4A02XCZ (rate), 4A02XHZ (sound) and 4A02XPZ (action currents).

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
2Cardiac
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
FRhythm
7. Qualifier
ZNo Qualifier

Other versions of this procedure

ICD-9-CM equivalent

Converter →
  • 37.20Noninvasive programmed electrical stimulation [NIPS]approximate
  • 89.51Rhythm electrocardiogramapproximate

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 4A02XFZ

Is 4A02XFZ a valid ICD-10-PCS code for 2027?

Yes. 4A02XFZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A02XFZ?

The CMS GEMs map 4A02XFZ to ICD-9-CM 37.20 (Noninvasive programmed electrical stimulation [NIPS]) and 89.51 (Rhythm electrocardiogram).