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ICD-10-PCS 2027 procedure code

4A133R1Monitoring of Arterial Saturation, Peripheral, Percutaneous Approach

✓ Valid for 2027

Short description: Monitoring of Arterial Saturation, Peripheral, Perc 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 4A133R1

4A133R1 is the ICD-10-PCS code for a monitoring procedure on the arterial using a percutaneous approach with saturation (qualifier: peripheral). 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 continuous intra-arterial blood gas monitoring, the ICD-9-CM procedure title it maps to (89.60).

The same procedure with a different approach is coded 4A130R1 (open) and 4A13XR1 (external).

With a different device, use 4A13351 (flow), 4A133B1 (pressure), 4A133H1 (sound) and 4A133J1 (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
3Arterial
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
RSaturation
7. Qualifier
1Peripheral

Other versions of this procedure

Different approach

ICD-9-CM equivalent

Converter →
  • 89.60Continuous intra-arterial blood gas monitoringapproximate

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 4A133R1

Is 4A133R1 a valid ICD-10-PCS code for 2027?

Yes. 4A133R1 is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A133R1?

The CMS GEMs map 4A133R1 to ICD-9-CM 89.60 (Continuous intra-arterial blood gas monitoring).