ICD-10-PCS 2027 procedure code
4A12X9ZMonitoring of Cardiac Output, External Approach
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 4A12X9Z
4A12X9Z is the ICD-10-PCS code for a monitoring procedure on the cardiac using an external approach with output. 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 monitoring of cardiac output by oxygen consumption technique and monitoring of cardiac output by other technique, the ICD-9-CM procedure titles it maps to (89.67 and 89.68).
The same procedure with a different approach is coded 4A1209Z (open), 4A1239Z (percutaneous), 4A1279Z (via natural or artificial opening) and 4A1289Z (via natural or artificial opening endoscopic).
With a different device, use 4A12X4Z (electrical activity), 4A12XCZ (rate), 4A12XFZ (rhythm) and 4A12XHZ (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
- 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
- 9Output
- 7. Qualifier
- ZNo Qualifier
Other versions of this procedure
ICD-9-CM equivalent
Converter →- 89.67Monitoring of cardiac output by oxygen consumption techniqueapproximate
- 89.68Monitoring of cardiac output by other techniqueapproximate
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
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about 4A12X9Z
Is 4A12X9Z a valid ICD-10-PCS code for 2027?
- Yes. 4A12X9Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
What is the ICD-9 procedure code for 4A12X9Z?
- The CMS GEMs map 4A12X9Z to ICD-9-CM 89.67 (Monitoring of cardiac output by oxygen consumption technique) and 89.68 (Monitoring of cardiac output by other technique).