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

Measurement and Monitoring›Physiological Systems›Monitoring
  • Billable / Specific Code
ICD-10-PCS 4A1685Z
CMS Source: FY 2026 ICD-10-PCS dataset. Effective Oct 1, 2025 – Sep 30, 2026.FacebookXLinkedInPrint

4A1685Z is a billable ICD-10-PCS procedure code for Monitoring of Lymphatic Flow, Via Natural or Artificial Opening Endoscopic. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The root operation Monitoring involves determining the level of a physiological or physical function repetitively over a period of time.

Code Identity

ICD-10-PCS Code
4A1685Z
Billable Status
Yes — Valid for Submission
Code Describes
Monitoring of Lymphatic Flow, Via Natural or Artificial Opening Endoscopic
Parent Code
4A1
Short Description
Monitoring of Lymphatic Flow, Endo

PCS Table Breakdown

Each ICD-10-PCS code is built from seven characters, each an axis of the procedure. Hover or tap the icons for the official CMS definitions.

PositionDesignationValueMeaning
1Section4Measurement and Monitoring
2Body SystemAPhysiological Systems
3Operation1Monitoring
4BodySystem6Lymphatic
5Approach8Via Natural or Artificial Opening Endoscopic
6Function/Device5Flow
7QualifierZNo Qualifier

Convert to ICD-9-PCS

Closest ICD-9-PCS equivalents for 4A1685Z under the General Equivalence Mappings.

40.19
Approximate match.

Code History

Replaces previously assigned code(s):
  • 4A1635Z — Monitoring of Lymphatic Flow, Percutaneous Approach
Replaced in the FY 2026 code set by:
  • 4A1685H — Monitoring of Lymphatic Flow using ICG dye, Endo

Similar Procedure Codes

Questions About 4A1685Z

Is 4A1685Z a billable code?

Yes. 4A1685Z is a complete seven-character ICD-10-PCS code, specific enough to report Monitoring of Lymphatic Flow, Via Natural or Artificial Opening Endoscopic on inpatient claims from October 1, 2025 through September 30, 2026.

What do the characters in 4A1685Z mean?

4A1685Z breaks down character by character: the 1st character 4 is the Section (Measurement and Monitoring); the 2nd character A is the Body System (Physiological Systems); the 3rd character 1 is the Operation (Monitoring); the 4th character 6 is the BodySystem (Lymphatic); the 5th character 8 is the Approach (Via Natural or Artificial Opening Endoscopic); the 6th character 5 is the Function/Device (Flow); the 7th character Z is the Qualifier (No Qualifier).

What is the ICD-9-PCS equivalent of 4A1685Z?

Under the General Equivalence Mappings, Monitoring of Lymphatic Flow, Via Natural or Artificial Opening Endoscopic crosswalks to ICD-9-PCS 40.19. The mapping is approximate, so confirm it fits the documentation.