4A1605ZMonitoring of Lymphatic Flow, Open Approach
- Billable / Specific Code
4A1605Z is a billable ICD-10-PCS procedure code for Monitoring of Lymphatic Flow, Open Approach. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to 6 MS-DRGs. The root operation Monitoring involves determining the level of a physiological or physical function repetitively over a period of time.
Code Identity
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.
| Position | Designation | Value | Meaning |
|---|---|---|---|
| 1 | Section | 4 | Measurement and Monitoring |
| 2 | Body System | A | Physiological Systems |
| 3 | Operation | 1 | Monitoring |
| 4 | BodySystem | 6 | Lymphatic |
| 5 | Approach | 0 | Open |
| 6 | Function/Device | 5 | Flow |
| 7 | Qualifier | Z | No Qualifier |
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for 4A1605Z under the General Equivalence Mappings.
Code History
- 4A1605H — Monitoring of Lymphatic Flow using ICG dye, Open Approach
Similar Procedure Codes
Questions About 4A1605Z
Is 4A1605Z a billable code?
Yes. 4A1605Z is a complete seven-character ICD-10-PCS code, specific enough to report Monitoring of Lymphatic Flow, Open Approach on inpatient claims from October 1, 2025 through September 30, 2026.
What do the characters in 4A1605Z mean?
4A1605Z 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 0 is the Approach (Open); the 6th character 5 is the Function/Device (Flow); the 7th character Z is the Qualifier (No Qualifier).
What MS-DRG does 4A1605Z group to?
On an inpatient stay, Monitoring of Lymphatic Flow, Open Approach maps to MS-DRGs 579, 580, 581, 802, 803, 804, with relative weights from 1.3560 to 3.9841. The MS-DRG sets the fixed Medicare payment for the stay.
What is the ICD-9-PCS equivalent of 4A1605Z?
Under the General Equivalence Mappings, Monitoring of Lymphatic Flow, Open Approach crosswalks to ICD-9-PCS 40.19. The mapping is approximate, so confirm it fits the documentation.
