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ICD-10-PCS 2027 procedure code

4A1685HMonitoring of Lymphatic Flow using Indocyanine Green Dye, Via Natural or Artificial Opening Endoscopic

✓ Valid for 2027

Short description: Monitoring of Lymphatic Flow using ICG dye, Endo

Code last changed in FY2020 (effective October 1, 2019). Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data

About 4A1685H

4A1685H is the ICD-10-PCS code for a monitoring procedure on the lymphatic using a via natural or artificial opening endoscopic approach with flow (qualifier: indocyanine green dye). In ICD-10-PCS, monitoring means determining the level of a physiological or physical function repetitively over a period of time.

The same procedure with a different approach is coded 4A1605H (open), 4A1635H (percutaneous) and 4A1675H (via natural or artificial opening).

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 FY2020, effective October 1, 2019.

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
6Lymphatic
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
5Flow
7. Qualifier
HIndocyanine Green Dye

Other versions of this procedure

Different qualifier

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
  • FY2020 (effective 10/1/2019): Added
  • No changes since FY2020.

Common questions about 4A1685H

Is 4A1685H a valid ICD-10-PCS code for 2027?

Yes. 4A1685H is valid for inpatient procedures from October 1, 2026 through September 30, 2027.