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ICD-10-PCS 2027 procedure code

4A1685ZMonitoring of Lymphatic Flow, Via Natural or Artificial Opening Endoscopic

✓ Valid for 2027

Short description: Monitoring of Lymphatic Flow, 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 4A1685Z

4A1685Z is the ICD-10-PCS code for a monitoring procedure on the lymphatic using a via natural or artificial opening endoscopic approach with flow. 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 other diagnostic procedures on lymphatic structures, the ICD-9-CM procedure title it maps to (40.19).

For a different body part, codes include 4A1D85Z (urinary).

The same procedure with a different approach is coded 4A1605Z (open), 4A1635Z (percutaneous) and 4A1675Z (via natural or artificial opening).

With a different device, use 4A168BZ (pressure).

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
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
ZNo Qualifier

Other versions of this procedure

Different body system

Different function / device

Different qualifier

ICD-9-CM equivalent

Converter →
  • 40.19Other diagnostic procedures on lymphatic structuresapproximate

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 4A1685Z

Is 4A1685Z a valid ICD-10-PCS code for 2027?

Yes. 4A1685Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A1685Z?

The CMS GEMs map 4A1685Z to ICD-9-CM 40.19 (Other diagnostic procedures on lymphatic structures).