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ICD-10-PCS 2027 procedure code

4A108RDMonitoring of Intracranial Saturation, Via Natural or Artificial Opening Endoscopic

✓ Valid for 2027

Short description: Monitoring of Intracranial Saturation, 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 4A108RD

4A108RD is the ICD-10-PCS code for a monitoring procedure on the central nervous using a via natural or artificial opening endoscopic approach with saturation (qualifier: intracranial). 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 intracranial oxygen monitoring, the ICD-9-CM procedure title it maps to (01.16).

The same procedure with a different approach is coded 4A103RD (percutaneous) and 4A107RD (via natural or artificial opening).

With a different device, use 4A108BD (pressure) and 4A108KD (temperature).

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
0Central Nervous
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
RSaturation
7. Qualifier
DIntracranial

Other versions of this procedure

Different function / device

ICD-9-CM equivalent

Converter →
  • 01.16Intracranial oxygen 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
  • FY2018 (effective 10/1/2017): Added
  • No changes since FY2018.

Common questions about 4A108RD

Is 4A108RD a valid ICD-10-PCS code for 2027?

Yes. 4A108RD is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A108RD?

The CMS GEMs map 4A108RD to ICD-9-CM 01.16 (Intracranial oxygen monitoring).