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ICD-10-PCS 2027 procedure code

4A020FZMeasurement of Cardiac Rhythm, Open 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 4A020FZ

4A020FZ is the ICD-10-PCS code for a measurement procedure on the cardiac using an open 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 rhythm electrocardiogram, the ICD-9-CM procedure title it maps to (89.51).

The same procedure with a different approach is coded 4A023FZ (percutaneous), 4A027FZ (via natural or artificial opening), 4A028FZ (via natural or artificial opening endoscopic) and 4A02XFZ (external).

With a different device, use 4A0204Z (electrical activity), 4A0209Z (output), 4A020CZ (rate), 4A020HZ (sound) and 4A020PZ (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
0Open

Cutting through the skin or mucous membrane and any other body layers necessary to expose the site of the procedure

6. Function / Device
FRhythm
7. Qualifier
ZNo Qualifier

Other versions of this procedure

ICD-9-CM equivalent

Converter →
  • 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 4A020FZ

Is 4A020FZ a valid ICD-10-PCS code for 2027?

Yes. 4A020FZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A020FZ?

The CMS GEMs map 4A020FZ to ICD-9-CM 89.51 (Rhythm electrocardiogram).