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ICD-10-PCS 2027 procedure code

4A140R2Monitoring of Venous Saturation, Portal, 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 4A140R2

4A140R2 is the ICD-10-PCS code for a monitoring procedure on the venous using an open approach with saturation (qualifier: portal). 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 measurement of mixed venous blood gases, the ICD-9-CM procedure title it maps to (89.66).

The same procedure with a different approach is coded 4A143R2 (percutaneous).

With a different device, use 4A14052 (flow), 4A140B2 (pressure) and 4A140J2 (pulse).

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
4Venous
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
RSaturation
7. Qualifier
2Portal

Other versions of this procedure

Different approach

Different function / device

ICD-9-CM equivalent

Converter →
  • 89.66Measurement of mixed venous blood gasesapproximate

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 4A140R2

Is 4A140R2 a valid ICD-10-PCS code for 2027?

Yes. 4A140R2 is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A140R2?

The CMS GEMs map 4A140R2 to ICD-9-CM 89.66 (Measurement of mixed venous blood gases).