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ICD-10-PCS 2027 procedure code

4A1635HMonitoring of Lymphatic Flow using Indocyanine Green Dye, Percutaneous Approach

✓ Valid for 2027

Short description: Monitoring of Lymphatic Flow using ICG dye, Perc Approach

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 4A1635H

4A1635H is the ICD-10-PCS code for a monitoring procedure on the lymphatic using a percutaneous 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), 4A1675H (via natural or artificial opening) and 4A1685H (via natural or artificial opening endoscopic).

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
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
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 4A1635H

Is 4A1635H a valid ICD-10-PCS code for 2027?

Yes. 4A1635H is valid for inpatient procedures from October 1, 2026 through September 30, 2027.