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ICD-10-PCS 2027 procedure code

4A127FZMonitoring of Cardiac Rhythm, Via Natural or Artificial Opening

✓ Valid for 2027

Short description: Monitoring of Cardiac Rhythm, Via Opening

Code last changed in FY2018 (effective October 1, 2017). Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data

About 4A127FZ

4A127FZ is the ICD-10-PCS code for a monitoring procedure on the cardiac using a via natural or artificial opening approach with rhythm. 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).

For a different body part, codes include 4A1H7FZ (products of conception, cardiac).

The same procedure with a different approach is coded 4A120FZ (open), 4A123FZ (percutaneous), 4A128FZ (via natural or artificial opening endoscopic) and 4A12XFZ (external).

With a different device, use 4A1274Z (electrical activity), 4A1279Z (output), 4A127CZ (rate) and 4A127HZ (sound).

It doesn't appear in the MS-DRG procedure index, so on its own it doesn't change the DRG assignment.

It was added in FY2018, effective October 1, 2017.

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
7Via Natural or Artificial Opening

Entry of instrumentation through a natural or artificial external opening to reach the site of the procedure

6. Function / Device
FRhythm
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
  • FY2018 (effective 10/1/2017): Added
  • No changes since FY2018.

Common questions about 4A127FZ

Is 4A127FZ a valid ICD-10-PCS code for 2027?

Yes. 4A127FZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A127FZ?

The CMS GEMs map 4A127FZ to ICD-9-CM 89.59 (Other nonoperative cardiac and vascular measurements).