ICD-10-PCS 2027 procedure code
4A128FZMonitoring of Cardiac Rhythm, Via Natural or Artificial Opening Endoscopic
Short description: Monitoring of Cardiac Rhythm, Endo
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 4A128FZ
4A128FZ is the ICD-10-PCS code for a monitoring procedure on the cardiac using a via natural or artificial opening endoscopic 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 4A1H8FZ (products of conception, cardiac).
The same procedure with a different approach is coded 4A120FZ (open), 4A123FZ (percutaneous), 4A127FZ (via natural or artificial opening) and 4A12XFZ (external).
With a different device, use 4A1284Z (electrical activity), 4A1289Z (output), 4A128CZ (rate) and 4A128HZ (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
- 8Via Natural or Artificial Opening Endoscopic
Entry of instrumentation through a natural or artificial external opening to reach and visualize the site of the procedure
- 6. Function / Device
- FRhythm
- 7. Qualifier
- ZNo Qualifier
Other versions of this procedure
Different body system
Different approach
Different function / device
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
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2018 (effective 10/1/2017): Added
- No changes since FY2018.
Common questions about 4A128FZ
Is 4A128FZ a valid ICD-10-PCS code for 2027?
- Yes. 4A128FZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
What is the ICD-9 procedure code for 4A128FZ?
- The CMS GEMs map 4A128FZ to ICD-9-CM 89.59 (Other nonoperative cardiac and vascular measurements).