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ICD-10-PCS 2027 procedure code

4A123CZMonitoring of Cardiac Rate, Percutaneous 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 4A123CZ

4A123CZ is the ICD-10-PCS code for a monitoring procedure on the cardiac using a percutaneous approach with rate. In ICD-10-PCS, monitoring means determining the level of a physiological or physical function repetitively over a period of time.

In plain terms, this corresponds to other nonoperative cardiac and vascular measurements, the ICD-9-CM procedure title it maps to (89.59).

The same procedure with a different approach is coded 4A120CZ (open), 4A127CZ (via natural or artificial opening), 4A128CZ (via natural or artificial opening endoscopic) and 4A12XCZ (external).

With a different device, use 4A1234Z (electrical activity), 4A1239Z (output), 4A123FZ (rhythm) and 4A123HZ (sound).

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
1Monitoring

Determining the level of a physiological or physical function repetitively over a period of time

4. Body System
2Cardiac
5. Approach
3Percutaneous

Entry, by puncture or minor incision, of instrumentation through the skin or mucous membrane and any other body layers necessary to reach the site of the procedure

6. Function / Device
CRate
7. Qualifier
ZNo Qualifier

Other versions of this procedure

ICD-9-CM equivalent

Converter →
  • 89.59Other nonoperative cardiac and vascular measurementsapproximate

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 4A123CZ

Is 4A123CZ a valid ICD-10-PCS code for 2027?

Yes. 4A123CZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A123CZ?

The CMS GEMs map 4A123CZ to ICD-9-CM 89.59 (Other nonoperative cardiac and vascular measurements).